diff --git a/.env.example b/.env.example
index c322157..4eaa657 100644
--- a/.env.example
+++ b/.env.example
@@ -1,4 +1,5 @@
 NODE_ENV="development"
+TRIBUFU_ACCESS_TOKEN=""
 TRIBUFU_API_KEY=""
 TRIBUFU_API_URL="https://api.tribufu.com"
 TRIBUFU_CLIENT_ID=""
diff --git a/examples/bearer.js b/examples/bearer.js
new file mode 100644
index 0000000..bea639e
--- /dev/null
+++ b/examples/bearer.js
@@ -0,0 +1,15 @@
+// Copyright (c) Tribufu. All Rights Reserved.
+// SPDX-License-Identifier: MIT AND Apache-2.0
+
+import dotenv from "dotenv";
+import { TribufuApi } from "../build/index.mjs";
+
+dotenv.config();
+
+async function main() {
+    const accessToken = process.env["TRIBUFU_ACCESS_TOKEN"];
+    const tribufu = TribufuApi.withAccessToken(accessToken);
+    console.log(await tribufu.getUserInfo());
+}
+
+main();
diff --git a/src/credentials.ts b/src/credentials.ts
new file mode 100644
index 0000000..3a9a626
--- /dev/null
+++ b/src/credentials.ts
@@ -0,0 +1,12 @@
+// Copyright (c) Tribufu. All Rights Reserved.
+// SPDX-License-Identifier: MIT
+
+export enum CredentialsType {
+    ApiKey,
+    Bearer,
+}
+
+export interface Credentials {
+    type: CredentialsType;
+    value: string;
+}
diff --git a/src/index.ts b/src/index.ts
index f841fb6..783a62d 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: MIT
 
 import { Configuration } from "./runtime";
+import { Credentials, CredentialsType } from "./credentials";
 import { JavaScriptRuntime } from "./node";
 import { TRIBUFU_API_URL, TRIBUFU_VERSION } from "./constants";
 import { TribufuGeneratedApi } from "./apis/TribufuGeneratedApi";
@@ -20,12 +21,12 @@ export * from "./singletion";
  */
 export class TribufuApi extends TribufuGeneratedApi {
     /**
-     * Create a TribufuApi with the given API key.
+     * Create a TribufuApi with the credentials.
      *
-     * @param apiKey The API key for authentication.
+     * @param credentials The credentials for authentication.
      */
-    constructor(apiKey: string | null = null) {
-        super(TribufuApi.createConfiguration(apiKey));
+    constructor(credentials: Credentials | null = null) {
+        super(TribufuApi.createConfiguration(credentials));
     }
 
     /**
@@ -46,7 +47,19 @@ export class TribufuApi extends TribufuGeneratedApi {
      * @returns TribufuApi
      */
     public static withApiKey(apiKey: string): TribufuApi {
-        return new TribufuApi(apiKey);
+        return new TribufuApi({ type: CredentialsType.ApiKey, value: apiKey });
+    }
+
+    /**
+     * Create a TribufuApi with the given access token.
+     *
+     * - A access token give you user read and write access to the Tribufu API.
+     *
+     * @param accessToken
+     * @returns TribufuApi
+     */
+    public static withAccessToken(accessToken: string): TribufuApi {
+        return new TribufuApi({ type: CredentialsType.Bearer, value: accessToken });
     }
 
     /**
@@ -96,14 +109,21 @@ export class TribufuApi extends TribufuGeneratedApi {
     /**
      * Creates a configuration for the Tribufu API client.
      */
-    private static createConfiguration(apiKey: string | null): Configuration {
+    private static createConfiguration(credentials: Credentials | null): Configuration {
         const basePath = this.getBaseUrl();
         const headers: Record<string, string> = {
             "User-Agent": this.getUserAgent(),
         };
 
-        if (apiKey) {
-            headers["Authorization"] = `ApiKey ${apiKey}`;
+        if (credentials) {
+            switch (credentials.type) {
+                case CredentialsType.ApiKey:
+                    headers["Authorization"] = `ApiKey ${credentials.value}`;
+                    break;
+                case CredentialsType.Bearer:
+                    headers["Authorization"] = `Bearer ${credentials.value}`;
+                    break;
+            }
         }
 
         return new Configuration({