diff --git a/package-lock.json b/package-lock.json
index e443ee7..7be6088 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "lhisp-oauth-client",
-  "version": "1.0.25",
+  "version": "1.0.26",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "lhisp-oauth-client",
-      "version": "1.0.25",
+      "version": "1.0.26",
       "license": "MIT",
       "dependencies": {
         "axios": "^1.6.1",
diff --git a/package.json b/package.json
index 1156f5c..31cab23 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lhisp-oauth-client",
-  "version": "1.0.25",
+  "version": "1.0.26",
   "main": "src/index",
   "types": "src/index.d.ts",
   "repository": "git@bitbucket.org:leandro_costa/lhisp-oauth-client.git",
diff --git a/src/lhisp-oauth-client.t.ts b/src/lhisp-oauth-client.t.ts
index a4bf572..38e5dfc 100644
--- a/src/lhisp-oauth-client.t.ts
+++ b/src/lhisp-oauth-client.t.ts
@@ -18,6 +18,7 @@ export interface LhispOauthClientConstructorParams {
   authHeaders?: Headers;
   grantType?: string;
   authContentType?: ContentType;
+  authData?: Record<string, string>;
   sendAuthCredentialsOnRequestBody?: boolean;
   formatAccessToken?: (accessToken?: AccessToken) => string;
   debug?: boolean;
diff --git a/src/lhisp-oauth-client.ts b/src/lhisp-oauth-client.ts
index c26024a..fd62132 100644
--- a/src/lhisp-oauth-client.ts
+++ b/src/lhisp-oauth-client.ts
@@ -28,6 +28,7 @@ export class LhispOauthClient<iAccessToken extends AccessToken = AccessToken> {
   protected authHeaders?: AxiosHeaders;
   protected grantType?: string;
   protected agent: https.Agent;
+  protected authData: Record<string, string> = {};
   protected accessToken?: iAccessToken;
   protected refreshToken?: iAccessToken;
   protected tokenCreatedAt = 0;
@@ -51,6 +52,7 @@ export class LhispOauthClient<iAccessToken extends AccessToken = AccessToken> {
     this.certificado = params.certificado;
     this.headers = (params.headers ? params.headers : {}) as any as AxiosHeaders;
     this.authHeaders = (params.authHeaders ? params.authHeaders : {}) as any as AxiosHeaders;
+    this.authData = params.authData || {};
     this.apiUrl = params.apiUrl;
     this.authUrl = params.authUrl;
     this.authScope = params.authScope;
@@ -105,7 +107,9 @@ export class LhispOauthClient<iAccessToken extends AccessToken = AccessToken> {
           "Content-Type": this.authContentType,
           ...this.authHeaders,
         },
-        data: {},
+        data: {
+          ...this.authData,
+        },
       };
 
       if (this.grantType) authRequestOpt.data.grant_type = this.grantType;