diff --git a/src/callback-endpoint.ts b/src/callback-endpoint.ts
index e27c113..30205f0 100644
--- a/src/callback-endpoint.ts
+++ b/src/callback-endpoint.ts
@@ -45,7 +45,7 @@ export const createCallbackEndpoint = (
       let access_token: string;
 
       if (pluginOptions.getToken) {
-        access_token = pluginOptions.getToken(code);
+        access_token = await pluginOptions.getToken(code);
       } else {
         const tokenResponse = await fetch(pluginOptions.tokenEndpoint, {
           method: "POST",
diff --git a/src/types.ts b/src/types.ts
index 1367a89..32c6cd4 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -115,7 +115,7 @@ export interface PluginTypes {
    * Function to get token from the OAuth providers.
    * If its not provided default will be used.
    */
-  getToken?: (code: string) => string;
+  getToken?: (code: string) => string | Promise<string>;
 
   /**
    * Redirect users after successful login.