diff --git a/go.sum b/go.sum
index 2ffd78e..cdd46b5 100644
--- a/go.sum
+++ b/go.sum
@@ -15,7 +15,6 @@ gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/h2non/gock.v1 v1.1.2 h1:jBbHXgGBK/AoPVfJh5x4r/WxIrElvbLel8TCZkkZJoY=
 gopkg.in/h2non/gock.v1 v1.1.2/go.mod h1:n7UGz/ckNChHiK05rDoiC4MYSunEC/lyaUm2WWaDva0=
-gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
diff --git a/v1/client_test.go b/v1/client_test.go
index 442593d..de92d72 100644
--- a/v1/client_test.go
+++ b/v1/client_test.go
@@ -3,6 +3,7 @@ package v1
 import (
 	"bytes"
 	"encoding/base64"
+	"errors"
 	"fmt"
 	"net/http"
 	"strings"
@@ -45,61 +46,65 @@ func (t *MGClientTest) Test_TransportChannels() {
 	t.gock().
 		Get(t.transportURL("channels")).
 		Reply(http.StatusOK).
-		JSON([]ChannelListItem{{
-			ID:         1,
-			ExternalID: "external_id",
-			Type:       "whatsapp",
-			Name:       &chName,
-			Settings: ChannelSettings{
-				Status: Status{
-					Delivered: ChannelFeatureNone,
-					Read:      ChannelFeatureSend,
-				},
-				Text: ChannelSettingsText{
-					Creating:      ChannelFeatureBoth,
-					Editing:       ChannelFeatureBoth,
-					Quoting:       ChannelFeatureBoth,
-					Deleting:      ChannelFeatureReceive,
-					MaxCharsCount: 4096,
-				},
-				Product: Product{
-					Creating: ChannelFeatureReceive,
-					Editing:  ChannelFeatureReceive,
-				},
-				Order: Order{
-					Creating: ChannelFeatureReceive,
-					Editing:  ChannelFeatureReceive,
-				},
-				File: ChannelSettingsFilesBase{
-					Creating: ChannelFeatureBoth,
-					Editing:  ChannelFeatureBoth,
-					Quoting:  ChannelFeatureBoth,
-					Deleting: ChannelFeatureReceive,
-					Max:      1,
-				},
-				Image: ChannelSettingsFilesBase{
-					Creating: ChannelFeatureBoth,
-					Editing:  ChannelFeatureBoth,
-					Quoting:  ChannelFeatureBoth,
-					Deleting: ChannelFeatureReceive,
-					Max:      1, // nolint:gomnd
-				},
-				Suggestions: ChannelSettingsSuggestions{
-					Text:  ChannelFeatureBoth,
-					Phone: ChannelFeatureBoth,
-					Email: ChannelFeatureBoth,
-				},
-				CustomerExternalID: ChannelFeatureCustomerExternalIDPhone,
-				SendingPolicy: SendingPolicy{
-					NewCustomer: ChannelFeatureSendingPolicyTemplate,
+		JSON(
+			[]ChannelListItem{
+				{
+					ID:         1,
+					ExternalID: "external_id",
+					Type:       "whatsapp",
+					Name:       &chName,
+					Settings: ChannelSettings{
+						Status: Status{
+							Delivered: ChannelFeatureNone,
+							Read:      ChannelFeatureSend,
+						},
+						Text: ChannelSettingsText{
+							Creating:      ChannelFeatureBoth,
+							Editing:       ChannelFeatureBoth,
+							Quoting:       ChannelFeatureBoth,
+							Deleting:      ChannelFeatureReceive,
+							MaxCharsCount: 4096,
+						},
+						Product: Product{
+							Creating: ChannelFeatureReceive,
+							Editing:  ChannelFeatureReceive,
+						},
+						Order: Order{
+							Creating: ChannelFeatureReceive,
+							Editing:  ChannelFeatureReceive,
+						},
+						File: ChannelSettingsFilesBase{
+							Creating: ChannelFeatureBoth,
+							Editing:  ChannelFeatureBoth,
+							Quoting:  ChannelFeatureBoth,
+							Deleting: ChannelFeatureReceive,
+							Max:      1,
+						},
+						Image: ChannelSettingsFilesBase{
+							Creating: ChannelFeatureBoth,
+							Editing:  ChannelFeatureBoth,
+							Quoting:  ChannelFeatureBoth,
+							Deleting: ChannelFeatureReceive,
+							Max:      1, // nolint:gomnd
+						},
+						Suggestions: ChannelSettingsSuggestions{
+							Text:  ChannelFeatureBoth,
+							Phone: ChannelFeatureBoth,
+							Email: ChannelFeatureBoth,
+						},
+						CustomerExternalID: ChannelFeatureCustomerExternalIDPhone,
+						SendingPolicy: SendingPolicy{
+							NewCustomer: ChannelFeatureSendingPolicyTemplate,
+						},
+					},
+					CreatedAt:     createdAt,
+					UpdatedAt:     &createdAt,
+					ActivatedAt:   createdAt,
+					DeactivatedAt: nil,
+					IsActive:      true,
 				},
 			},
-			CreatedAt:     createdAt,
-			UpdatedAt:     &createdAt,
-			ActivatedAt:   createdAt,
-			DeactivatedAt: nil,
-			IsActive:      true,
-		}})
+		)
 
 	data, status, err := c.TransportChannels(Channels{Active: true})
 	t.Require().NoError(err)
@@ -147,11 +152,13 @@ func (t *MGClientTest) Test_ActivateTransportChannel() {
 	t.gock().
 		Post(t.transportURL("channels")).
 		Reply(http.StatusCreated).
-		JSON(ActivateResponse{
-			ChannelID:   1,
-			ExternalID:  "external_id_1",
-			ActivatedAt: time.Now(),
-		})
+		JSON(
+			ActivateResponse{
+				ChannelID:   1,
+				ExternalID:  "external_id_1",
+				ActivatedAt: time.Now(),
+			},
+		)
 
 	data, status, err := c.ActivateTransportChannel(ch)
 	t.Require().NoError(err)
@@ -200,19 +207,23 @@ func (t *MGClientTest) Test_ActivateNewTransportChannel() {
 	t.gock().
 		Post(t.transportURL("channels")).
 		Reply(http.StatusCreated).
-		JSON(ActivateResponse{
-			ChannelID:   1,
-			ExternalID:  "external_id_1",
-			ActivatedAt: time.Now(),
-		})
+		JSON(
+			ActivateResponse{
+				ChannelID:   1,
+				ExternalID:  "external_id_1",
+				ActivatedAt: time.Now(),
+			},
+		)
 
 	t.gock().
 		Delete(t.transportURL("channels/1")).
 		Reply(http.StatusOK).
-		JSON(DeleteResponse{
-			ChannelID:     1,
-			DeactivatedAt: time.Now(),
-		})
+		JSON(
+			DeleteResponse{
+				ChannelID:     1,
+				DeactivatedAt: time.Now(),
+			},
+		)
 
 	data, status, err := c.ActivateTransportChannel(ch)
 	t.Require().NoError(err)
@@ -266,11 +277,13 @@ func (t *MGClientTest) Test_UpdateTransportChannel() {
 	t.gock().
 		Put(t.transportURL("channels/1")).
 		Reply(http.StatusOK).
-		JSON(UpdateResponse{
-			ChannelID:  uint64(1),
-			ExternalID: "external_id_1",
-			UpdatedAt:  time.Now(),
-		})
+		JSON(
+			UpdateResponse{
+				ChannelID:  uint64(1),
+				ExternalID: "external_id_1",
+				UpdatedAt:  time.Now(),
+			},
+		)
 
 	data, status, err := c.UpdateTransportChannel(ch)
 	t.Require().NoError(err)
@@ -287,27 +300,31 @@ func (t *MGClientTest) Test_TransportTemplates() {
 	t.gock().
 		Get(t.transportURL("templates")).
 		Reply(http.StatusOK).
-		JSON([]Template{{
-			Code:      "tpl_code",
-			ChannelID: 1,
-			Name:      "Test Template",
-			Enabled:   true,
-			Type:      TemplateTypeText,
-			Template: []TemplateItem{
+		JSON(
+			[]Template{
 				{
-					Type: TemplateItemTypeText,
-					Text: "Hello, ",
-				},
-				{
-					Type:    TemplateItemTypeVar,
-					VarType: TemplateVarFirstName,
-				},
-				{
-					Type: TemplateItemTypeText,
-					Text: "! We're glad to see you back in our store.",
+					Code:      "tpl_code",
+					ChannelID: 1,
+					Name:      "Test Template",
+					Enabled:   true,
+					Type:      TemplateTypeText,
+					Template: []TemplateItem{
+						{
+							Type: TemplateItemTypeText,
+							Text: "Hello, ",
+						},
+						{
+							Type:    TemplateItemTypeVar,
+							VarType: TemplateVarFirstName,
+						},
+						{
+							Type: TemplateItemTypeText,
+							Text: "! We're glad to see you back in our store.",
+						},
+					},
 				},
 			},
-		}})
+		)
 
 	data, status, err := c.TransportTemplates()
 	t.Assert().NoError(err, fmt.Sprintf("%d %s", status, err))
@@ -390,10 +407,12 @@ func (t *MGClientTest) Test_UpdateTemplate() {
 	defer gock.Off()
 
 	t.gock().
-		Filter(func(r *http.Request) bool {
-			return r.Method == http.MethodPut &&
-				r.URL.Path == "/api/transport/v1/channels/1/templates/encodable#code"
-		}).
+		Filter(
+			func(r *http.Request) bool {
+				return r.Method == http.MethodPut &&
+					r.URL.Path == "/api/transport/v1/channels/1/templates/encodable#code"
+			},
+		).
 		Reply(http.StatusOK).
 		JSON(map[string]interface{}{})
 
@@ -440,9 +459,11 @@ func (t *MGClientTest) Test_UpdateTemplateFail() {
 	defer gock.Off()
 	t.gock().
 		Reply(http.StatusBadRequest).
-		JSON(map[string][]string{
-			"errors": {"Some weird error message..."},
-		})
+		JSON(
+			map[string][]string{
+				"errors": {"Some weird error message..."},
+			},
+		)
 
 	status, err := c.UpdateTemplate(tpl)
 	t.Assert().Error(err, fmt.Sprintf("%d %s", status, err))
@@ -453,10 +474,12 @@ func (t *MGClientTest) Test_DeactivateTemplate() {
 
 	defer gock.Off()
 	t.gock().
-		Filter(func(r *http.Request) bool {
-			return r.Method == http.MethodDelete &&
-				r.URL.Path == t.transportURL("channels/1/templates/test_template#code")
-		}).
+		Filter(
+			func(r *http.Request) bool {
+				return r.Method == http.MethodDelete &&
+					r.URL.Path == t.transportURL("channels/1/templates/test_template#code")
+			},
+		).
 		Reply(http.StatusOK).
 		JSON(map[string]interface{}{})
 
@@ -487,10 +510,12 @@ func (t *MGClientTest) Test_TextMessages() {
 	t.gock().
 		Post(t.transportURL("messages")).
 		Reply(http.StatusOK).
-		JSON(MessagesResponse{
-			MessageID: 1,
-			Time:      time.Now(),
-		})
+		JSON(
+			MessagesResponse{
+				MessageID: 1,
+				Time:      time.Now(),
+			},
+		)
 
 	data, status, err := c.Messages(snd)
 	t.Require().NoError(err)
@@ -507,26 +532,32 @@ func (t *MGClientTest) Test_ImageMessages() {
 	t.gock().
 		Post(t.transportURL("files/upload_by_url")).
 		Reply(http.StatusOK).
-		JSON(UploadFileResponse{
-			ID:        "1",
-			Hash:      "1",
-			Type:      "image/png",
-			MimeType:  "",
-			Size:      1024,
-			CreatedAt: time.Now(),
-		})
+		JSON(
+			UploadFileResponse{
+				ID:        "1",
+				Hash:      "1",
+				Type:      "image/png",
+				MimeType:  "",
+				Size:      1024,
+				CreatedAt: time.Now(),
+			},
+		)
 
 	t.gock().
 		Post(t.transportURL("messages")).
 		Reply(http.StatusOK).
-		JSON(MessagesResponse{
-			MessageID: 1,
-			Time:      time.Now(),
-		})
+		JSON(
+			MessagesResponse{
+				MessageID: 1,
+				Time:      time.Now(),
+			},
+		)
 
-	uploadFileResponse, st, err := c.UploadFileByURL(UploadFileByUrlRequest{
-		Url: "https://via.placeholder.com/1",
-	})
+	uploadFileResponse, st, err := c.UploadFileByURL(
+		UploadFileByUrlRequest{
+			Url: "https://via.placeholder.com/1",
+		},
+	)
 	t.Require().NoError(err)
 	t.Assert().Equal(http.StatusOK, st)
 	t.Assert().Equal("1", uploadFileResponse.ID)
@@ -569,10 +600,12 @@ func (t *MGClientTest) Test_UpdateMessages() {
 	t.gock().
 		Put(t.transportURL("messages")).
 		Reply(http.StatusOK).
-		JSON(MessagesResponse{
-			MessageID: 1,
-			Time:      time.Now(),
-		})
+		JSON(
+			MessagesResponse{
+				MessageID: 1,
+				Time:      time.Now(),
+			},
+		)
 
 	dataU, status, err := c.UpdateMessages(sndU)
 	t.Require().NoError(err)
@@ -599,28 +632,34 @@ func (t *MGClientTest) Test_MarkMessageReadAndDelete() {
 
 	t.gock().
 		Delete(t.transportURL("messages")).
-		JSON(DeleteData{
-			Message: Message{
-				ExternalID: "deleted",
+		JSON(
+			DeleteData{
+				Message: Message{
+					ExternalID: "deleted",
+				},
+				Channel: 1,
 			},
-			Channel: 1,
-		}).
+		).
 		Reply(http.StatusOK).
-		JSON(MessagesResponse{
-			MessageID: 2,
-			Time:      time.Now(),
-		})
+		JSON(
+			MessagesResponse{
+				MessageID: 2,
+				Time:      time.Now(),
+			},
+		)
 
 	_, status, err := c.MarkMessageRead(snd)
 	t.Require().NoError(err)
 	t.Assert().Equal(http.StatusOK, status)
 
-	previousChatMessage, status, err := c.DeleteMessage(DeleteData{
-		Message{
-			ExternalID: "deleted",
+	previousChatMessage, status, err := c.DeleteMessage(
+		DeleteData{
+			Message{
+				ExternalID: "deleted",
+			},
+			1,
 		},
-		1,
-	})
+	)
 	t.Require().NoError(err)
 	t.Assert().Equal(http.StatusOK, status)
 	t.Assert().Equal(2, previousChatMessage.MessageID)
@@ -633,10 +672,12 @@ func (t *MGClientTest) Test_DeactivateTransportChannel() {
 	t.gock().
 		Delete(t.transportURL("channels/1")).
 		Reply(http.StatusOK).
-		JSON(DeleteResponse{
-			ChannelID:     1,
-			DeactivatedAt: time.Now(),
-		})
+		JSON(
+			DeleteResponse{
+				ChannelID:     1,
+				DeactivatedAt: time.Now(),
+			},
+		)
 
 	deleteData, status, err := c.DeactivateTransportChannel(1)
 	t.Require().NoError(err)
@@ -679,9 +720,10 @@ func (t *MGClientTest) Test_UploadFile() {
 	t.Assert().Equal(resp, data)
 }
 
-func (t *MGClientTest) Test_SuccessHandleAPIError() {
+func (t *MGClientTest) Test_SuccessHandleError() {
 	client := t.client()
-	handleError := client.Error([]byte(`{"errors": ["Channel not found"]}`))
+	json := `{"errors": ["Channel not found"]}`
+	handleError := client.Error([]byte(json))
 
 	t.Assert().IsType(new(httpClientError), handleError)
 	t.Assert().Equal(handleError.Error(), "Channel not found")
@@ -691,9 +733,25 @@ func (t *MGClientTest) Test_SuccessHandleAPIError() {
 		Delete(t.transportURL("channels/123")).
 		Reply(http.StatusInternalServerError)
 
+	t.gock().
+		Delete(t.transportURL("channels/455")).
+		Reply(http.StatusBadRequest).
+		JSON(json)
+
 	_, statusCode, err := client.DeactivateTransportChannel(123)
 
 	t.Assert().Equal(http.StatusInternalServerError, statusCode)
 	t.Assert().IsType(new(httpClientError), err)
 	t.Assert().Equal("Internal server error", err.Error())
+	var serverErr *httpClientError
+	if errors.As(err, &serverErr) {
+		t.Assert().NotNil(serverErr.ResponseBody)
+	} else {
+		t.Fail("Unexpected type of error")
+	}
+
+	_, statusCode, err = client.DeactivateTransportChannel(455)
+	t.Assert().Equal(http.StatusBadRequest, statusCode)
+	t.Assert().IsType(new(httpClientError), err)
+	t.Assert().Equal("Channel not found", err.Error())
 }
diff --git a/v1/errors.go b/v1/errors.go
index 326f455..233bfdb 100644
--- a/v1/errors.go
+++ b/v1/errors.go
@@ -2,14 +2,19 @@ package v1
 
 import (
 	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
 )
 
 var defaultErrorMessage = "Internal http client error"
 var internalServerError = "Internal server error"
 
 type httpClientError struct {
-	ErrorMsg  string
-	BaseError error
+	ErrorMsg     string
+	BaseError    error
+	ResponseBody io.ReadCloser
 }
 
 func (err *httpClientError) Unwrap() error {
@@ -20,10 +25,10 @@ func (err *httpClientError) Error() string {
 	message := defaultErrorMessage
 
 	if err.BaseError != nil {
-		message = err.BaseError.Error()
+		message = fmt.Sprintf("%s - %s", defaultErrorMessage, err.BaseError.Error())
 	}
 
-	if len([]rune(err.ErrorMsg)) > 0 {
+	if len(err.ErrorMsg) > 0 {
 		message = err.ErrorMsg
 	}
 
@@ -50,4 +55,22 @@ func NewAPIClientError(responseBody []byte) error {
 	}
 
 	return &httpClientError{ErrorMsg: message}
-}
\ No newline at end of file
+}
+
+func NewServerError(response *http.Response) error {
+	var data []byte
+	body, err := buildRawResponse(response)
+	if err == nil {
+		data = body
+	}
+
+	err = NewAPIClientError(data)
+	var serverError *httpClientError
+
+	if errors.As(err, &serverError) {
+		serverError.ResponseBody = response.Body
+		return serverError
+	}
+
+	return err
+}
diff --git a/v1/errors_test.go b/v1/errors_test.go
index 130e780..74e2462 100644
--- a/v1/errors_test.go
+++ b/v1/errors_test.go
@@ -1,7 +1,11 @@
 package v1
 
 import (
+	"bytes"
 	"errors"
+	"fmt"
+	"io"
+	"net/http"
 	"net/url"
 	"testing"
 
@@ -15,7 +19,7 @@ func TestNewCriticalHTTPError(t *testing.T) {
 	assert.IsType(t, new(httpClientError), httpErr)
 	assert.IsType(t, new(url.Error), errors.Unwrap(httpErr))
 	assert.IsType(t, new(url.Error), errors.Unwrap(httpErr))
-	assert.Equal(t, httpErr.Error(), err.Error())
+	assert.Equal(t, httpErr.Error(), fmt.Sprintf("%s - %s", defaultErrorMessage, err.Error()))
 }
 
 func TestNewApiClientError(t *testing.T) {
@@ -30,4 +34,21 @@ func TestNewApiClientError(t *testing.T) {
 
 	assert.IsType(t, new(httpClientError), httpErr)
 	assert.Equal(t, httpErr.Error(), internalServerError)
-}
\ No newline at end of file
+}
+
+func TestNewServerError(t *testing.T) {
+	body := []byte(`{"errors" : ["Something went wrong"]}`)
+	response := new(http.Response)
+	response.Body = io.NopCloser(bytes.NewReader(body))
+	serverErr := NewServerError(response)
+
+	assert.IsType(t, new(httpClientError), serverErr)
+	assert.Equal(t, serverErr.Error(), "Something went wrong")
+
+	var err *httpClientError
+	if errors.As(serverErr, &err) {
+		assert.NotNil(t, err.ResponseBody)
+	} else {
+		t.Fatal("Unexpected type of error")
+	}
+}
diff --git a/v1/helpers.go b/v1/helpers.go
new file mode 100644
index 0000000..3c11ef1
--- /dev/null
+++ b/v1/helpers.go
@@ -0,0 +1,17 @@
+package v1
+
+import (
+	"io"
+	"net/http"
+)
+
+func buildRawResponse(resp *http.Response) ([]byte, error) {
+	defer resp.Body.Close()
+
+	res, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return res, err
+	}
+
+	return res, nil
+}
diff --git a/v1/request.go b/v1/request.go
index 275327b..3fac2a9 100644
--- a/v1/request.go
+++ b/v1/request.go
@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"strings"
 )
@@ -74,30 +73,19 @@ func makeRequest(reqType, url string, buf io.Reader, c *MgClient) ([]byte, int,
 		return res, 0, NewCriticalHTTPError(err)
 	}
 
+	if resp.StatusCode >= http.StatusInternalServerError {
+		err = NewServerError(resp)
+		return res, resp.StatusCode, err
+	}
+
 	res, err = buildRawResponse(resp)
 	if err != nil {
 		return res, 0, err
 	}
 
-	if resp.StatusCode >= http.StatusInternalServerError {
-		err = NewAPIClientError(res)
-		return res, resp.StatusCode, err
-	}
-
 	if c.Debug {
 		c.writeLog("MG TRANSPORT API Response: %s", res)
 	}
 
 	return res, resp.StatusCode, err
 }
-
-func buildRawResponse(resp *http.Response) ([]byte, error) {
-	defer resp.Body.Close()
-
-	res, err := ioutil.ReadAll(resp.Body)
-	if err != nil {
-		return res, err
-	}
-
-	return res, nil
-}
diff --git a/v1/types.go b/v1/types.go
index d90d775..239741c 100644
--- a/v1/types.go
+++ b/v1/types.go
@@ -66,23 +66,6 @@ const (
 	OriginatorChannel
 )
 
-// ClientError is error of http-client or network.
-type ClientError string
-
-func (err ClientError) Error() string {
-	return string(err)
-}
-
-// APIError is error with 5xx status code.
-type APIError struct {
-	code     int
-	errorMsg string
-}
-
-func (err APIError) Error() string {
-	return fmt.Sprintf("Error message: %s, code: %v", err.errorMsg, err.code)
-}
-
 type ErrorType string
 
 const (