diff --git a/v5/client.go b/v5/client.go
index 2f6ef4a..0b0d6d6 100644
--- a/v5/client.go
+++ b/v5/client.go
@@ -2,7 +2,6 @@ package v5
 
 import (
 	"encoding/json"
-	"errors"
 	"fmt"
 	"io/ioutil"
 	"net/http"
@@ -29,36 +28,46 @@ func New(url string, key string) *Client {
 }
 
 // GetRequest implements GET Request
-func (c *Client) GetRequest(urlWithParameters string) ([]byte, int, error) {
+func (c *Client) GetRequest(urlWithParameters string) ([]byte, int, ErrorResponse) {
 	var res []byte
+	var bug ErrorResponse
 
 	req, err := http.NewRequest("GET", fmt.Sprintf("%s%s", c.Url, urlWithParameters), nil)
 	if err != nil {
-		return res, 0, err
+		bug.ErrorMsg = err.Error()
+		return res, 0, bug
 	}
 
 	req.Header.Set("X-API-KEY", c.Key)
 
 	resp, err := c.httpClient.Do(req)
 	if err != nil {
-		return res, 0, err
+		bug.ErrorMsg = err.Error()
+		return res, 0, bug
 	}
 
 	if resp.StatusCode >= http.StatusInternalServerError {
-		return res, resp.StatusCode, errors.New(fmt.Sprintf("HTTP request error. Status code: %d.\n", resp.StatusCode))
+		bug.ErrorMsg = fmt.Sprintf("HTTP request error. Status code: %d.\n", resp.StatusCode)
+		return res, resp.StatusCode, bug
 	}
 
 	res, err = buildRawResponse(resp)
 	if err != nil {
-		return res, 0, err
+		bug.ErrorMsg = err.Error()
 	}
 
-	return res, resp.StatusCode, nil
+	eresp, _ := c.ErrorResponse(res)
+	if eresp.ErrorMsg != "" {
+		return res, resp.StatusCode, eresp
+	}
+
+	return res, resp.StatusCode, bug
 }
 
 // PostRequest implements POST Request
-func (c *Client) PostRequest(url string, postParams url.Values) ([]byte, int, error) {
+func (c *Client) PostRequest(url string, postParams url.Values) ([]byte, int, ErrorResponse) {
 	var res []byte
+	var bug ErrorResponse
 
 	req, err := http.NewRequest(
 		"POST",
@@ -66,7 +75,8 @@ func (c *Client) PostRequest(url string, postParams url.Values) ([]byte, int, er
 		strings.NewReader(postParams.Encode()),
 	)
 	if err != nil {
-		return res, 0, err
+		bug.ErrorMsg = err.Error()
+		return res, 0, bug
 	}
 
 	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
@@ -74,19 +84,27 @@ func (c *Client) PostRequest(url string, postParams url.Values) ([]byte, int, er
 
 	resp, err := c.httpClient.Do(req)
 	if err != nil {
-		return res, 0, err
+		bug.ErrorMsg = err.Error()
+		return res, 0, bug
 	}
 
 	if resp.StatusCode >= http.StatusInternalServerError {
-		return res, resp.StatusCode, errors.New(fmt.Sprintf("HTTP request error. Status code: %d.\n", resp.StatusCode))
+		bug.ErrorMsg = fmt.Sprintf("HTTP request error. Status code: %d.\n", resp.StatusCode)
+		return res, resp.StatusCode, bug
 	}
 
 	res, err = buildRawResponse(resp)
 	if err != nil {
-		return res, 0, err
+		bug.ErrorMsg = err.Error()
+		return res, 0, bug
 	}
 
-	return res, resp.StatusCode, nil
+	eresp, _ := c.ErrorResponse(res)
+	if eresp.ErrorMsg != "" {
+		return res, resp.StatusCode, eresp
+	}
+
+	return res, resp.StatusCode, bug
 }
 
 func buildRawResponse(resp *http.Response) ([]byte, error) {
@@ -123,65 +141,65 @@ func fillSite(p *url.Values, site []string) {
 }
 
 // ApiVersions get available API versions
-func (c *Client) ApiVersions() (*VersionResponse, int, error) {
+func (c *Client) ApiVersions() (*VersionResponse, int, ErrorResponse) {
 	var resp VersionResponse
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/api-versions", unversionedPrefix))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // ApiCredentials get available API methods
-func (c *Client) ApiCredentials() (*CredentialResponse, int, error) {
+func (c *Client) ApiCredentials() (*CredentialResponse, int, ErrorResponse) {
 	var resp CredentialResponse
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/credentials", unversionedPrefix))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // StaticticUpdate update statistic
-func (c *Client) StaticticUpdate() (*SucessfulResponse, int, error) {
+func (c *Client) StaticticUpdate() (*SucessfulResponse, int, ErrorResponse) {
 	var resp SucessfulResponse
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/statistic/update", versionedPrefix))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // Segments get segments
-func (c *Client) Segments(parameters SegmentsRequest) (*SegmentsResponse, int, error) {
+func (c *Client) Segments(parameters SegmentsRequest) (*SegmentsResponse, int, ErrorResponse) {
 	var resp SegmentsResponse
 
 	params, _ := query.Values(parameters)
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/segments?%s", versionedPrefix, params.Encode()))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // Customer get method
-func (c *Client) Customer(id, by, site string) (*CustomerResponse, int, error) {
+func (c *Client) Customer(id, by, site string) (*CustomerResponse, int, ErrorResponse) {
 	var resp CustomerResponse
 	var context = checkBy(by)
 
@@ -189,33 +207,33 @@ func (c *Client) Customer(id, by, site string) (*CustomerResponse, int, error) {
 	params, _ := query.Values(fw)
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/customers/%s?%s", versionedPrefix, id, params.Encode()))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // Customers list method
-func (c *Client) Customers(parameters CustomersRequest) (*CustomersResponse, int, error) {
+func (c *Client) Customers(parameters CustomersRequest) (*CustomersResponse, int, ErrorResponse) {
 	var resp CustomersResponse
 
 	params, _ := query.Values(parameters)
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/customers?%s", versionedPrefix, params.Encode()))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // CustomerCreate method
-func (c *Client) CustomerCreate(customer Customer, site ...string) (*CustomerChangeResponse, int, error) {
+func (c *Client) CustomerCreate(customer Customer, site ...string) (*CustomerChangeResponse, int, ErrorResponse) {
 	var resp CustomerChangeResponse
 
 	customerJson, _ := json.Marshal(&customer)
@@ -227,17 +245,17 @@ func (c *Client) CustomerCreate(customer Customer, site ...string) (*CustomerCha
 	fillSite(&p, site)
 
 	data, status, err := c.PostRequest(fmt.Sprintf("%s/customers/create", versionedPrefix), p)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // CustomerEdit method
-func (c *Client) CustomerEdit(customer Customer, by string, site ...string) (*CustomerChangeResponse, int, error) {
+func (c *Client) CustomerEdit(customer Customer, by string, site ...string) (*CustomerChangeResponse, int, ErrorResponse) {
 	var resp CustomerChangeResponse
 	var uid = strconv.Itoa(customer.Id)
 	var context = checkBy(by)
@@ -256,17 +274,17 @@ func (c *Client) CustomerEdit(customer Customer, by string, site ...string) (*Cu
 	fillSite(&p, site)
 
 	data, status, err := c.PostRequest(fmt.Sprintf("%s/customers/%s/edit", versionedPrefix, uid), p)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // CustomersUpload method
-func (c *Client) CustomersUpload(customers []Customer, site ...string) (*CustomersUploadResponse, int, error) {
+func (c *Client) CustomersUpload(customers []Customer, site ...string) (*CustomersUploadResponse, int, ErrorResponse) {
 	var resp CustomersUploadResponse
 
 	uploadJson, _ := json.Marshal(&customers)
@@ -278,17 +296,17 @@ func (c *Client) CustomersUpload(customers []Customer, site ...string) (*Custome
 	fillSite(&p, site)
 
 	data, status, err := c.PostRequest(fmt.Sprintf("%s/customers/upload", versionedPrefix), p)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // CustomersFixExternalIds method
-func (c *Client) CustomersFixExternalIds(customers []IdentifiersPair) (*SucessfulResponse, int, error) {
+func (c *Client) CustomersFixExternalIds(customers []IdentifiersPair) (*SucessfulResponse, int, ErrorResponse) {
 	var resp SucessfulResponse
 
 	customersJson, _ := json.Marshal(&customers)
@@ -298,33 +316,33 @@ func (c *Client) CustomersFixExternalIds(customers []IdentifiersPair) (*Sucessfu
 	}
 
 	data, status, err := c.PostRequest(fmt.Sprintf("%s/customers/fix-external-ids", versionedPrefix), p)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // CustomersHistory method
-func (c *Client) CustomersHistory(parameters CustomersHistoryRequest) (*CustomersHistoryResponse, int, error) {
+func (c *Client) CustomersHistory(parameters CustomersHistoryRequest) (*CustomersHistoryResponse, int, ErrorResponse) {
 	var resp CustomersHistoryResponse
 
 	params, _ := query.Values(parameters)
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/customers/history?%s", versionedPrefix, params.Encode()))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // Order get method
-func (c *Client) Order(id, by, site string) (*OrderResponse, int, error) {
+func (c *Client) Order(id, by, site string) (*OrderResponse, int, ErrorResponse) {
 	var resp OrderResponse
 	var context = checkBy(by)
 
@@ -332,33 +350,33 @@ func (c *Client) Order(id, by, site string) (*OrderResponse, int, error) {
 	params, _ := query.Values(fw)
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/orders/%s?%s", versionedPrefix, id, params.Encode()))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // Orders list method
-func (c *Client) Orders(parameters OrdersRequest) (*OrdersResponse, int, error) {
+func (c *Client) Orders(parameters OrdersRequest) (*OrdersResponse, int, ErrorResponse) {
 	var resp OrdersResponse
 
 	params, _ := query.Values(parameters)
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/orders?%s", versionedPrefix, params.Encode()))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // OrderCreate method
-func (c *Client) OrderCreate(order Order, site ...string) (*CreateResponse, int, error) {
+func (c *Client) OrderCreate(order Order, site ...string) (*CreateResponse, int, ErrorResponse) {
 	var resp CreateResponse
 	orderJson, _ := json.Marshal(&order)
 
@@ -369,17 +387,17 @@ func (c *Client) OrderCreate(order Order, site ...string) (*CreateResponse, int,
 	fillSite(&p, site)
 
 	data, status, err := c.PostRequest(fmt.Sprintf("%s/orders/create", versionedPrefix), p)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // OrderEdit method
-func (c *Client) OrderEdit(order Order, by string, site ...string) (*CreateResponse, int, error) {
+func (c *Client) OrderEdit(order Order, by string, site ...string) (*CreateResponse, int, ErrorResponse) {
 	var resp CreateResponse
 	var uid = strconv.Itoa(order.Id)
 	var context = checkBy(by)
@@ -398,17 +416,17 @@ func (c *Client) OrderEdit(order Order, by string, site ...string) (*CreateRespo
 	fillSite(&p, site)
 
 	data, status, err := c.PostRequest(fmt.Sprintf("%s/orders/%s/edit", versionedPrefix, uid), p)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // OrdersUpload method
-func (c *Client) OrdersUpload(orders []Order, site ...string) (*OrdersUploadResponse, int, error) {
+func (c *Client) OrdersUpload(orders []Order, site ...string) (*OrdersUploadResponse, int, ErrorResponse) {
 	var resp OrdersUploadResponse
 
 	uploadJson, _ := json.Marshal(&orders)
@@ -420,17 +438,17 @@ func (c *Client) OrdersUpload(orders []Order, site ...string) (*OrdersUploadResp
 	fillSite(&p, site)
 
 	data, status, err := c.PostRequest(fmt.Sprintf("%s/orders/upload", versionedPrefix), p)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // OrdersFixExternalIds method
-func (c *Client) OrdersFixExternalIds(orders []IdentifiersPair) (*SucessfulResponse, int, error) {
+func (c *Client) OrdersFixExternalIds(orders []IdentifiersPair) (*SucessfulResponse, int, ErrorResponse) {
 	var resp SucessfulResponse
 
 	ordersJson, _ := json.Marshal(&orders)
@@ -440,77 +458,77 @@ func (c *Client) OrdersFixExternalIds(orders []IdentifiersPair) (*SucessfulRespo
 	}
 
 	data, status, err := c.PostRequest(fmt.Sprintf("%s/orders/fix-external-ids", versionedPrefix), p)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // OrdersHistory method
-func (c *Client) OrdersHistory(parameters OrdersHistoryRequest) (*CustomersHistoryResponse, int, error) {
+func (c *Client) OrdersHistory(parameters OrdersHistoryRequest) (*CustomersHistoryResponse, int, ErrorResponse) {
 	var resp CustomersHistoryResponse
 
 	params, _ := query.Values(parameters)
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/customers/history?%s", versionedPrefix, params.Encode()))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // User get method
-func (c *Client) User(id int) (*UserResponse, int, error) {
+func (c *Client) User(id int) (*UserResponse, int, ErrorResponse) {
 	var resp UserResponse
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/users/%d", versionedPrefix, id))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // Users list method
-func (c *Client) Users(parameters UsersRequest) (*UsersResponse, int, error) {
+func (c *Client) Users(parameters UsersRequest) (*UsersResponse, int, ErrorResponse) {
 	var resp UsersResponse
 
 	params, _ := query.Values(parameters)
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/users?%s", versionedPrefix, params.Encode()))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // UserGroups list method
-func (c *Client) UserGroups(parameters UserGroupsRequest) (*UserGroupsResponse, int, error) {
+func (c *Client) UserGroups(parameters UserGroupsRequest) (*UserGroupsResponse, int, ErrorResponse) {
 	var resp UserGroupsResponse
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/user-groups", versionedPrefix))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // UserStatus update method
-func (c *Client) UserStatus(id int, status string) (*SucessfulResponse, int, error) {
+func (c *Client) UserStatus(id int, status string) (*SucessfulResponse, int, ErrorResponse) {
 	var resp SucessfulResponse
 
 	p := url.Values{
@@ -518,47 +536,47 @@ func (c *Client) UserStatus(id int, status string) (*SucessfulResponse, int, err
 	}
 
 	data, st, err := c.PostRequest(fmt.Sprintf("%s/users/%d/status", versionedPrefix, id), p)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, st, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, st, err
 }
 
 // Task get method
-func (c *Client) Task(id int) (*TaskResponse, int, error) {
+func (c *Client) Task(id int) (*TaskResponse, int, ErrorResponse) {
 	var resp TaskResponse
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/tasks/%d", versionedPrefix, id))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // Tasks list method
-func (c *Client) Tasks(parameters TasksRequest) (*TasksResponse, int, error) {
+func (c *Client) Tasks(parameters TasksRequest) (*TasksResponse, int, ErrorResponse) {
 	var resp TasksResponse
 
 	params, _ := query.Values(parameters)
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/tasks?%s", versionedPrefix, params.Encode()))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // TaskCreate method
-func (c *Client) TaskCreate(task Task, site ...string) (*CreateResponse, int, error) {
+func (c *Client) TaskCreate(task Task, site ...string) (*CreateResponse, int, ErrorResponse) {
 	var resp CreateResponse
 	taskJson, _ := json.Marshal(&task)
 
@@ -569,17 +587,17 @@ func (c *Client) TaskCreate(task Task, site ...string) (*CreateResponse, int, er
 	fillSite(&p, site)
 
 	data, status, err := c.PostRequest(fmt.Sprintf("%s/tasks/create", versionedPrefix), p)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // TaskEdit method
-func (c *Client) TaskEdit(task Task, site ...string) (*SucessfulResponse, int, error) {
+func (c *Client) TaskEdit(task Task, site ...string) (*SucessfulResponse, int, ErrorResponse) {
 	var resp SucessfulResponse
 	var uid = strconv.Itoa(task.Id)
 
@@ -592,33 +610,33 @@ func (c *Client) TaskEdit(task Task, site ...string) (*SucessfulResponse, int, e
 	fillSite(&p, site)
 
 	data, status, err := c.PostRequest(fmt.Sprintf("%s/tasks/%s/edit", versionedPrefix, uid), p)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // Notes list method
-func (c *Client) Notes(parameters NotesRequest) (*NotesResponse, int, error) {
+func (c *Client) Notes(parameters NotesRequest) (*NotesResponse, int, ErrorResponse) {
 	var resp NotesResponse
 
 	params, _ := query.Values(parameters)
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/customers/notes?%s", versionedPrefix, params.Encode()))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // NoteCreate method
-func (c *Client) NoteCreate(note Note, site ...string) (*CreateResponse, int, error) {
+func (c *Client) NoteCreate(note Note, site ...string) (*CreateResponse, int, ErrorResponse) {
 	var resp CreateResponse
 
 	noteJson, _ := json.Marshal(&note)
@@ -630,17 +648,17 @@ func (c *Client) NoteCreate(note Note, site ...string) (*CreateResponse, int, er
 	fillSite(&p, site)
 
 	data, status, err := c.PostRequest(fmt.Sprintf("%s/customers/notes/create", versionedPrefix), p)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // NoteDelete method
-func (c *Client) NoteDelete(id int) (*SucessfulResponse, int, error) {
+func (c *Client) NoteDelete(id int) (*SucessfulResponse, int, ErrorResponse) {
 	var resp SucessfulResponse
 
 	p := url.Values{
@@ -648,17 +666,17 @@ func (c *Client) NoteDelete(id int) (*SucessfulResponse, int, error) {
 	}
 
 	data, status, err := c.PostRequest(fmt.Sprintf("%s/customers/notes/%d/delete", versionedPrefix, id), p)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // PaymentCreate method
-func (c *Client) PaymentCreate(payment Payment, site ...string) (*CreateResponse, int, error) {
+func (c *Client) PaymentCreate(payment Payment, site ...string) (*CreateResponse, int, ErrorResponse) {
 	var resp CreateResponse
 
 	paymentJson, _ := json.Marshal(&payment)
@@ -670,17 +688,17 @@ func (c *Client) PaymentCreate(payment Payment, site ...string) (*CreateResponse
 	fillSite(&p, site)
 
 	data, status, err := c.PostRequest(fmt.Sprintf("%s/orders/payments/create", versionedPrefix), p)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // PaymentDelete method
-func (c *Client) PaymentDelete(id int) (*SucessfulResponse, int, error) {
+func (c *Client) PaymentDelete(id int) (*SucessfulResponse, int, ErrorResponse) {
 	var resp SucessfulResponse
 
 	p := url.Values{
@@ -688,17 +706,17 @@ func (c *Client) PaymentDelete(id int) (*SucessfulResponse, int, error) {
 	}
 
 	data, status, err := c.PostRequest(fmt.Sprintf("%s/orders/payments/%d/delete", versionedPrefix, id), p)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // PaymentEdit method
-func (c *Client) PaymentEdit(payment Payment, by string, site ...string) (*SucessfulResponse, int, error) {
+func (c *Client) PaymentEdit(payment Payment, by string, site ...string) (*SucessfulResponse, int, ErrorResponse) {
 	var resp SucessfulResponse
 	var uid = strconv.Itoa(payment.Id)
 	var context = checkBy(by)
@@ -716,249 +734,249 @@ func (c *Client) PaymentEdit(payment Payment, by string, site ...string) (*Suces
 	fillSite(&p, site)
 
 	data, status, err := c.PostRequest(fmt.Sprintf("%s/orders/payments/%s/edit", versionedPrefix, uid), p)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // Countries method
-func (c *Client) Countries() (*CountriesResponse, int, error) {
+func (c *Client) Countries() (*CountriesResponse, int, ErrorResponse) {
 	var resp CountriesResponse
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/reference/countries", versionedPrefix))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // CostGroups method
-func (c *Client) CostGroups() (*CostGroupsResponse, int, error) {
+func (c *Client) CostGroups() (*CostGroupsResponse, int, ErrorResponse) {
 	var resp CostGroupsResponse
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/reference/cost-groups", versionedPrefix))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // CostItems method
-func (c *Client) CostItems() (*CostItemsResponse, int, error) {
+func (c *Client) CostItems() (*CostItemsResponse, int, ErrorResponse) {
 	var resp CostItemsResponse
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/reference/cost-items", versionedPrefix))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // Couriers method
-func (c *Client) Couriers() (*CouriersResponse, int, error) {
+func (c *Client) Couriers() (*CouriersResponse, int, ErrorResponse) {
 	var resp CouriersResponse
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/reference/couriers", versionedPrefix))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // DeliveryService method
-func (c *Client) DeliveryService() (*DeliveryServiceResponse, int, error) {
+func (c *Client) DeliveryService() (*DeliveryServiceResponse, int, ErrorResponse) {
 	var resp DeliveryServiceResponse
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/reference/delivery-services", versionedPrefix))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // DeliveryTypes method
-func (c *Client) DeliveryTypes() (*DeliveryTypesResponse, int, error) {
+func (c *Client) DeliveryTypes() (*DeliveryTypesResponse, int, ErrorResponse) {
 	var resp DeliveryTypesResponse
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/reference/delivery-types", versionedPrefix))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // LegalEntities method
-func (c *Client) LegalEntities() (*LegalEntitiesResponse, int, error) {
+func (c *Client) LegalEntities() (*LegalEntitiesResponse, int, ErrorResponse) {
 	var resp LegalEntitiesResponse
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/reference/legal-entities", versionedPrefix))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // OrderMethods method
-func (c *Client) OrderMethods() (*OrderMethodsResponse, int, error) {
+func (c *Client) OrderMethods() (*OrderMethodsResponse, int, ErrorResponse) {
 	var resp OrderMethodsResponse
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/reference/order-methods", versionedPrefix))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // OrderTypes method
-func (c *Client) OrderTypes() (*OrderTypesResponse, int, error) {
+func (c *Client) OrderTypes() (*OrderTypesResponse, int, ErrorResponse) {
 	var resp OrderTypesResponse
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/reference/order-types", versionedPrefix))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // PaymentStatuses method
-func (c *Client) PaymentStatuses() (*PaymentStatusesResponse, int, error) {
+func (c *Client) PaymentStatuses() (*PaymentStatusesResponse, int, ErrorResponse) {
 	var resp PaymentStatusesResponse
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/reference/payment-statuses", versionedPrefix))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // PaymentTypes method
-func (c *Client) PaymentTypes() (*PaymentTypesResponse, int, error) {
+func (c *Client) PaymentTypes() (*PaymentTypesResponse, int, ErrorResponse) {
 	var resp PaymentTypesResponse
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/reference/payment-types", versionedPrefix))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // PriceTypes method
-func (c *Client) PriceTypes() (*PriceTypesResponse, int, error) {
+func (c *Client) PriceTypes() (*PriceTypesResponse, int, ErrorResponse) {
 	var resp PriceTypesResponse
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/reference/price-types", versionedPrefix))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // ProductStatuses method
-func (c *Client) ProductStatuses() (*ProductStatusesResponse, int, error) {
+func (c *Client) ProductStatuses() (*ProductStatusesResponse, int, ErrorResponse) {
 	var resp ProductStatusesResponse
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/reference/product-statuses", versionedPrefix))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // Statuses method
-func (c *Client) Statuses() (*StatusesResponse, int, error) {
+func (c *Client) Statuses() (*StatusesResponse, int, ErrorResponse) {
 	var resp StatusesResponse
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/reference/statuses", versionedPrefix))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // StatusGroups method
-func (c *Client) StatusGroups() (*StatusGroupsResponse, int, error) {
+func (c *Client) StatusGroups() (*StatusGroupsResponse, int, ErrorResponse) {
 	var resp StatusGroupsResponse
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/reference/status-groups", versionedPrefix))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // Sites method
-func (c *Client) Sites() (*SitesResponse, int, error) {
+func (c *Client) Sites() (*SitesResponse, int, ErrorResponse) {
 	var resp SitesResponse
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/reference/sites", versionedPrefix))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
 
 // Stores method
-func (c *Client) Stores() (*StoresResponse, int, error) {
+func (c *Client) Stores() (*StoresResponse, int, ErrorResponse) {
 	var resp StoresResponse
 
 	data, status, err := c.GetRequest(fmt.Sprintf("%s/reference/stores", versionedPrefix))
-	if err != nil {
+	if err.ErrorMsg != "" {
 		return &resp, status, err
 	}
 
-	err = json.Unmarshal(data, &resp)
+	json.Unmarshal(data, &resp)
 
 	return &resp, status, err
 }
diff --git a/v5/client_test.go b/v5/client_test.go
index 88185d8..8543afc 100644
--- a/v5/client_test.go
+++ b/v5/client_test.go
@@ -55,7 +55,7 @@ func TestClient_ApiVersionsVersions(t *testing.T) {
 	c := client()
 
 	data, status, err := c.ApiVersions()
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Fail()
 	}
 
@@ -72,7 +72,7 @@ func TestClient_ApiCredentialsCredentials(t *testing.T) {
 	c := client()
 
 	data, status, err := c.ApiCredentials()
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Fail()
 	}
 
@@ -95,7 +95,7 @@ func TestClient_CustomersCustomers(t *testing.T) {
 		Page: 3,
 	})
 
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -123,7 +123,7 @@ func TestClient_CustomerChange(t *testing.T) {
 	}
 
 	cr, sc, err := c.CustomerCreate(f)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -142,7 +142,7 @@ func TestClient_CustomerChange(t *testing.T) {
 	f.Vip = true
 
 	ed, se, err := c.CustomerEdit(f, "id")
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -158,7 +158,7 @@ func TestClient_CustomerChange(t *testing.T) {
 	}
 
 	data, status, err := c.Customer(f.ExternalId, "externalId", "")
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -193,7 +193,7 @@ func TestClient_CustomersUpload(t *testing.T) {
 	}
 
 	data, status, err := c.CustomersUpload(customers)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -219,7 +219,7 @@ func TestClient_CustomersFixExternalIds(t *testing.T) {
 	}
 
 	cr, sc, err := c.CustomerCreate(f)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%s", sc)
 		t.Fail()
 	}
@@ -240,7 +240,7 @@ func TestClient_CustomersFixExternalIds(t *testing.T) {
 	}}
 
 	fx, fe, err := c.CustomersFixExternalIds(customers)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -265,7 +265,7 @@ func TestClient_CustomersHistory(t *testing.T) {
 	}
 
 	data, status, err := c.CustomersHistory(f)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -290,7 +290,7 @@ func TestClient_NotesNotes(t *testing.T) {
 	c := client()
 
 	data, status, err := c.Notes(NotesRequest{Page: 1})
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -316,7 +316,7 @@ func TestClient_NotesCreateDelete(t *testing.T) {
 		ExternalId: RandomString(8),
 		Email:      fmt.Sprintf("%s@example.com", RandomString(8)),
 	})
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -338,7 +338,7 @@ func TestClient_NotesCreateDelete(t *testing.T) {
 			Id: createCustomerResponse.Id,
 		},
 	})
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -354,7 +354,7 @@ func TestClient_NotesCreateDelete(t *testing.T) {
 	}
 
 	noteDeleteResponse, noteDeleteStatus, err := c.NoteDelete(noteCreateResponse.Id)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -374,7 +374,7 @@ func TestClient_OrdersOrders(t *testing.T) {
 	c := client()
 
 	data, status, err := c.Orders(OrdersRequest{Filter: OrdersFilter{City: "Москва"}, Page: 1})
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -404,7 +404,7 @@ func TestClient_OrderChange(t *testing.T) {
 	}
 
 	cr, sc, err := c.OrderCreate(f)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -423,7 +423,7 @@ func TestClient_OrderChange(t *testing.T) {
 	f.CustomerComment = "test comment"
 
 	ed, se, err := c.OrderEdit(f, "id")
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -439,7 +439,7 @@ func TestClient_OrderChange(t *testing.T) {
 	}
 
 	data, status, err := c.Order(f.ExternalId, "externalId", "")
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -474,7 +474,7 @@ func TestClient_OrdersUpload(t *testing.T) {
 	}
 
 	data, status, err := c.OrdersUpload(orders)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -500,7 +500,7 @@ func TestClient_OrdersFixExternalIds(t *testing.T) {
 	}
 
 	cr, sc, err := c.OrderCreate(f)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%s", sc)
 		t.Fail()
 	}
@@ -521,7 +521,7 @@ func TestClient_OrdersFixExternalIds(t *testing.T) {
 	}}
 
 	fx, fe, err := c.OrdersFixExternalIds(orders)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -541,7 +541,7 @@ func TestClient_OrdersHistory(t *testing.T) {
 	c := client()
 
 	data, status, err := c.OrdersHistory(OrdersHistoryRequest{Filter: OrdersHistoryFilter{SinceId: 20}})
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -574,7 +574,7 @@ func TestClient_PaymentCreateEditDelete(t *testing.T) {
 	}
 
 	createOrderResponse, status, err := c.OrderCreate(order)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -598,7 +598,7 @@ func TestClient_PaymentCreateEditDelete(t *testing.T) {
 	}
 
 	paymentCreateResponse, status, err := c.PaymentCreate(f)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -619,7 +619,7 @@ func TestClient_PaymentCreateEditDelete(t *testing.T) {
 	}
 
 	paymentEditResponse, status, err := c.PaymentEdit(k, "id")
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -635,7 +635,7 @@ func TestClient_PaymentCreateEditDelete(t *testing.T) {
 	}
 
 	paymentDeleteResponse, status, err := c.PaymentDelete(paymentCreateResponse.Id)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -662,7 +662,7 @@ func TestClient_TasksTasks(t *testing.T) {
 	}
 
 	data, status, err := c.Tasks(f)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -687,7 +687,7 @@ func TestClient_TaskChange(t *testing.T) {
 	}
 
 	cr, sc, err := c.TaskCreate(f)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -706,7 +706,7 @@ func TestClient_TaskChange(t *testing.T) {
 	f.Commentary = RandomString(20)
 
 	gt, sg, err := c.Task(f.Id)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -722,7 +722,7 @@ func TestClient_TaskChange(t *testing.T) {
 	}
 
 	data, status, err := c.TaskEdit(f)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -742,7 +742,7 @@ func TestClient_UsersUsers(t *testing.T) {
 	c := client()
 
 	data, status, err := c.Users(UsersRequest{Filter: UsersFilter{Active: 1}, Page: 1})
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -762,7 +762,7 @@ func TestClient_UsersUser(t *testing.T) {
 	c := client()
 
 	data, st, err := c.User(user)
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -782,7 +782,7 @@ func TestClient_UsersGroups(t *testing.T) {
 	c := client()
 
 	data, status, err := c.UserGroups(UserGroupsRequest{Page: 1})
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -802,7 +802,7 @@ func TestClient_UsersUpdate(t *testing.T) {
 	c := client()
 
 	data, st, err := c.UserStatus(user, "busy")
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -822,7 +822,7 @@ func TestClient_StaticticUpdate(t *testing.T) {
 	c := client()
 
 	data, st, err := c.StaticticUpdate()
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -842,7 +842,7 @@ func TestClient_Countries(t *testing.T) {
 	c := client()
 
 	data, st, err := c.Couriers()
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -862,7 +862,7 @@ func TestClient_CostGroups(t *testing.T) {
 	c := client()
 
 	data, st, err := c.CostGroups()
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -882,7 +882,7 @@ func TestClient_CostItems(t *testing.T) {
 	c := client()
 
 	data, st, err := c.CostItems()
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -902,7 +902,7 @@ func TestClient_Couriers(t *testing.T) {
 	c := client()
 
 	data, st, err := c.Couriers()
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -922,7 +922,7 @@ func TestClient_DeliveryService(t *testing.T) {
 	c := client()
 
 	data, st, err := c.DeliveryService()
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -942,7 +942,7 @@ func TestClient_DeliveryTypes(t *testing.T) {
 	c := client()
 
 	data, st, err := c.DeliveryTypes()
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -962,7 +962,7 @@ func TestClient_LegalEntities(t *testing.T) {
 	c := client()
 
 	data, st, err := c.LegalEntities()
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -982,7 +982,7 @@ func TestClient_OrderMethods(t *testing.T) {
 	c := client()
 
 	data, st, err := c.OrderMethods()
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -1002,7 +1002,7 @@ func TestClient_OrderTypes(t *testing.T) {
 	c := client()
 
 	data, st, err := c.OrderTypes()
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -1022,7 +1022,7 @@ func TestClient_PaymentStatuses(t *testing.T) {
 	c := client()
 
 	data, st, err := c.PaymentStatuses()
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -1042,7 +1042,7 @@ func TestClient_PaymentTypes(t *testing.T) {
 	c := client()
 
 	data, st, err := c.PaymentTypes()
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -1062,7 +1062,7 @@ func TestClient_PriceTypes(t *testing.T) {
 	c := client()
 
 	data, st, err := c.PriceTypes()
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -1082,7 +1082,7 @@ func TestClient_ProductStatuses(t *testing.T) {
 	c := client()
 
 	data, st, err := c.ProductStatuses()
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -1102,7 +1102,7 @@ func TestClient_Statuses(t *testing.T) {
 	c := client()
 
 	data, st, err := c.Statuses()
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -1122,7 +1122,7 @@ func TestClient_StatusGroups(t *testing.T) {
 	c := client()
 
 	data, st, err := c.StatusGroups()
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -1142,7 +1142,7 @@ func TestClient_Sites(t *testing.T) {
 	c := client()
 
 	data, st, err := c.Sites()
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
@@ -1162,7 +1162,7 @@ func TestClient_Stores(t *testing.T) {
 	c := client()
 
 	data, st, err := c.Stores()
-	if err != nil {
+	if err.ErrorMsg != "" {
 		t.Errorf("%v", err)
 		t.Fail()
 	}
diff --git a/v5/response.go b/v5/response.go
index a6ac635..888be88 100644
--- a/v5/response.go
+++ b/v5/response.go
@@ -9,11 +9,11 @@ type ErrorResponse struct {
 }
 
 // ErrorResponse method
-func (c *Client) ErrorResponse(data []byte) (*ErrorResponse, error) {
+func (c *Client) ErrorResponse(data []byte) (ErrorResponse, error) {
 	var resp ErrorResponse
 	err := json.Unmarshal(data, &resp)
 
-	return &resp, err
+	return resp, err
 }
 
 // SucessfulResponse type