diff --git a/src/index.ts b/src/index.ts
index f980e70..144a45c 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,2 +1,2 @@
-export * from './lhisp-oauth-client';
-export * from './lhisp-oauth-client.t';
\ No newline at end of file
+export * from "./lhisp-oauth-client";
+export * from "./lhisp-oauth-client.t";
diff --git a/src/lhisp-oauth-client.t.ts b/src/lhisp-oauth-client.t.ts
index d945320..cacb4f8 100644
--- a/src/lhisp-oauth-client.t.ts
+++ b/src/lhisp-oauth-client.t.ts
@@ -1,45 +1,44 @@
 import { AxiosRequestConfig } from "axios";
 
 export interface Headers {
-    [name: string]: any;
+  [name: string]: any;
 }
 
 export interface LhispOauthClientConstructorParams {
-    authUrl: string;
-    apiUrl: string;
-    clientId: string;
-    clientSecret: string;
-    certificado?: string;
-    senhaCertificado?: string;
-    authScope?: string;
-    authHeaderName?: string;
-    tokenHeaderName?: string;
-    headers?: Headers;
-    grantType?: string;
-    authContentType?: ContentType;
-    sendAuthCredentialsOnRequestBody?: boolean;
-    debug?: boolean;
+  authUrl: string;
+  apiUrl: string;
+  clientId: string;
+  clientSecret: string;
+  certificado?: string;
+  senhaCertificado?: string;
+  authScope?: string;
+  authHeaderName?: string;
+  tokenHeaderName?: string;
+  headers?: Headers;
+  grantType?: string;
+  authContentType?: ContentType;
+  sendAuthCredentialsOnRequestBody?: boolean;
+  debug?: boolean;
 }
 
 export interface ExecutarRequestParams extends AxiosRequestConfig {
-    path: string;
-    contentType?: ContentType,
+  path: string;
+  contentType?: ContentType;
 }
 
 export interface AccessToken {
-    token_type: string;
-    access_token: string;
-    expires_in: number;
-    scope?: string;
-    created_at?: number;
+  token_type: string;
+  access_token: string;
+  expires_in: number;
+  scope?: string;
 }
 
 export enum ContentType {
-    APPLICATION_JSON='application/json',
-    APPLICATION_X_WWW_FORM_URLENCODED='application/x-www-form-urlencoded',
+  APPLICATION_JSON = "application/json",
+  APPLICATION_X_WWW_FORM_URLENCODED = "application/x-www-form-urlencoded",
 }
 
-export const defaultGrantType = 'client_credentials';
+export const defaultGrantType = "client_credentials";
 export const defaultAuthContentType = ContentType.APPLICATION_X_WWW_FORM_URLENCODED;
-export const defaultAuthHeaderName = 'Authorization';
-export const defaultTokenHeaderName = 'Authorization';
\ No newline at end of file
+export const defaultAuthHeaderName = "Authorization";
+export const defaultTokenHeaderName = "Authorization";
diff --git a/src/lhisp-oauth-client.ts b/src/lhisp-oauth-client.ts
index f7f0e9e..6295d6e 100644
--- a/src/lhisp-oauth-client.ts
+++ b/src/lhisp-oauth-client.ts
@@ -13,7 +13,7 @@ import {
 } from "./lhisp-oauth-client.t";
 import logger from "lhisp-logger";
 
-export class LhispOauthClient {
+export class LhispOauthClient<iAccessToken extends AccessToken = AccessToken> {
   protected authUrl: string;
   protected apiUrl: string;
   protected clientId: string;
@@ -27,8 +27,10 @@ export class LhispOauthClient {
   protected headers?: Headers;
   protected grantType?: string;
   protected agent: https.Agent;
-  protected accessToken?: AccessToken;
-  protected refreshToken?: AccessToken;
+  protected accessToken?: iAccessToken;
+  protected refreshToken?: iAccessToken;
+  protected tokenCreatedAt = 0;
+  protected tokenExpiresIn = 0;
   protected sendAuthCredentialsOnRequestBody?: boolean;
 
   constructor(params: LhispOauthClientConstructorParams) {
@@ -75,16 +77,16 @@ export class LhispOauthClient {
     }
   }
 
-  isTokenValid(token: AccessToken) {
-    if (!token) return false;
-    if (!token.created_at) return false;
-    const timeDiff = (Date.now() - token.created_at) / 1000;
-    return timeDiff < token.expires_in - 10;
+  isTokenValid() {
+    if (!this.accessToken) return false;
+    if (!this.tokenCreatedAt) return false;
+    const timeDiff = (Date.now() - this.tokenCreatedAt) / 1000;
+    return timeDiff < this.tokenExpiresIn - 10;
   }
 
-  async getAccessToken(): Promise<AccessToken> {
+  async getAccessToken(): Promise<iAccessToken> {
     try {
-      if (this.accessToken && this.isTokenValid(this.accessToken)) {
+      if (this.accessToken && this.isTokenValid()) {
         return this.accessToken;
       }
 
@@ -113,21 +115,18 @@ export class LhispOauthClient {
         data: authRequestOpt.data,
         contentType: this.authContentType,
       });
-      const response = await axios.request(authRequestOpt);
-      return this.buildAccessToken(response.data);
+      const resp = await axios.request<iAccessToken>(authRequestOpt);
+      this.accessToken = this.buildAccessToken(resp.data);
+      this.tokenCreatedAt = new Date().getTime();
+      return this.accessToken;
     } catch (error) {
       logger.error({ message: "LhispOauthClient.getAccessToken", error });
       throw error;
     }
   }
 
-  buildAccessToken(data: Omit<AccessToken, "created_at">): AccessToken {
-    this.accessToken = {
-      ...data,
-      created_at: Date.now(),
-    };
-
-    return this.accessToken;
+  buildAccessToken(data: any) {
+    return data as iAccessToken;
   }
 
   getAuthToken() {
@@ -143,14 +142,10 @@ export class LhispOauthClient {
   }: ExecutarRequestParams): Promise<ResponseType> {
     try {
       await this.getAccessToken();
-      if (!this.accessToken?.token_type) {
-        console.log("## LHOAUTH2 NO TOKEN ?:", this.accessToken);
-      }
 
       let headers = {
         "Content-Type": contentType,
         [this.tokenHeaderName]: this.getAuthToken(),
-        // ...this.headers
       };
 
       const response = await axios.request<ResponseType>({