diff --git a/adapters/http/http.go b/adapters/http/http.go
index e415597..b0c3804 100644
--- a/adapters/http/http.go
+++ b/adapters/http/http.go
@@ -25,9 +25,9 @@ type httpAdapter struct {
 
 var (
 	// ErrorNilData no data
-	ErrorNilData = errors.New("No data to parse ")
+	ErrorNilData = errors.New("no data to parse ")
 	// ErrorNilAuth no auth service
-	ErrorNilAuth = errors.New("No auth to parse ")
+	ErrorNilAuth = errors.New("no auth to parse ")
 )
 
 // New returns an httpAdapter
@@ -36,7 +36,8 @@ func New(client HTTPClient, baseUrl string) *httpAdapter {
 }
 
 // DoRequest is the httpAdapter requester
-func (h *httpAdapter) DoRequest(method, path string, reader io.Reader, headers map[string]string) ([]byte, int, error) {
+func (h *httpAdapter) DoRequest(method, path string, reader io.Reader, headers map[string]string) (response []byte, status int, err error) {
+	glg.Debugf("[DoRequest]: method:%v, url:%v\n", method, h.baseUrl+path)
 	request, err := http.NewRequest(method, h.baseUrl+path, reader)
 	if err != nil {
 		return nil, 0, err
diff --git a/examples/auth/main.go b/examples/auth/main.go
new file mode 100644
index 0000000..d04754c
--- /dev/null
+++ b/examples/auth/main.go
@@ -0,0 +1,30 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+
+	sdk "github.com/arxdsilva/golang-ifood-sdk/container"
+)
+
+func main() {
+	var clientID, clientSecret string
+	clientID = os.Getenv("CLIENT_ID")
+	clientSecret = os.Getenv("CLIENT_SECRET")
+	// START new SDK instance
+	c := sdk.Create(clientID, clientSecret, 0, true)
+	// Get user code to connect this supplier to the restaurant
+	uc, err := c.AuthService.V2GetUserCode()
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Printf("v2 user: %+v\n", uc)
+	v2Creds, err := c.AuthService.V2Authenticate(
+		"client_credentials",
+		uc.Usercode, uc.AuthorizationCodeVerifier, "")
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Printf("v2 creds: %+v\n", v2Creds)
+}
diff --git a/services/authentication/authentication.go b/services/authentication/authentication.go
index 61c4cca..afa2178 100644
--- a/services/authentication/authentication.go
+++ b/services/authentication/authentication.go
@@ -8,7 +8,6 @@ import (
 	"mime/multipart"
 	"net/http"
 	"net/url"
-	"strconv"
 	"strings"
 	"time"
 
@@ -17,6 +16,7 @@ import (
 )
 
 const (
+	authRoot         = "/authentication/v1.0"
 	authEndpoint     = "/oauth/token"
 	userCodeEndpoint = "/oauth/userCode"
 	valueGrantType   = "password"
@@ -76,8 +76,6 @@ type (
 		currentExpiration      time.Time
 		Token                  string
 		refreshToken           string
-		authCode               string
-		authCodeVerifier       string
 		v2                     bool
 	}
 )
@@ -88,18 +86,18 @@ func New(adapter adapters.Http, clientId, clientSecret string, v2 bool) Service
 }
 
 func (a *authService) V2GetUserCode() (uc *UserCode, err error) {
-	data := url.Values{}
-	data.Set("client_id", a.clientId)
+	params := url.Values{}
+	params.Add("clientId", a.clientId)
+	body := strings.NewReader(params.Encode())
 	headers := make(map[string]string)
 	headers["Content-Type"] = "application/x-www-form-urlencoded"
-	headers["Content-Length"] = strconv.Itoa(len(data.Encode()))
-	body := strings.NewReader(data.Encode())
-	resp, status, err := a.adapter.DoRequest(http.MethodPost, userCodeEndpoint, body, headers)
+	resp, status, err := a.adapter.DoRequest(http.MethodPost, authRoot+userCodeEndpoint, body, headers)
 	if err != nil {
 		glg.Error("[SDK] (V2GetUserCode::DoRequest) error: ", err.Error())
 		return
 	}
 	if status != http.StatusOK {
+		glg.Debug("[SDK] (V2GetUserCode::status.check): resp ", string(resp))
 		glg.Warn("[SDK] (V2GetUserCode::status.check): status code ", status)
 		err = ErrUnauthorized
 		return
@@ -127,9 +125,8 @@ func (a *authService) V2Authenticate(authType, authCode, authCodeVerifier, refre
 	data.Set("refreshToken", refreshToken)
 	headers := make(map[string]string)
 	headers["Content-Type"] = "application/x-www-form-urlencoded"
-	headers["Content-Length"] = strconv.Itoa(len(data.Encode()))
 	body := strings.NewReader(data.Encode())
-	resp, status, err := a.adapter.DoRequest(http.MethodPost, authEndpoint, body, headers)
+	resp, status, err := a.adapter.DoRequest(http.MethodPost, authRoot+authEndpoint, body, headers)
 	if err != nil {
 		glg.Error("[SDK] (V2Authenticate::DoRequest) error: ", err.Error())
 		return