diff --git a/alice/onboarding/onboarding.py b/alice/onboarding/onboarding.py
index ded81ba..ddc8544 100644
--- a/alice/onboarding/onboarding.py
+++ b/alice/onboarding/onboarding.py
@@ -371,11 +371,14 @@ def void_selfie(
             )
 
     def supported_documents(
-        self, user_id: str, verbose: bool = False
+        self, user_id: str = None, verbose: bool = False
     ) -> Result[Dict[str, str], OnboardingError]:
         """
         This method is used to obtain a hierarchical-ordered dict with the information of the documents supported by the API.
 
+        This method can be called accessed with both USER_TOKEN and BACKEND_TOKEN.
+        If you provide a user_id this method call it using the USER_TOKEN, otherwise it will be called with the BACKEND_TOKEN
+
         Parameters
         ----------
         user_id
diff --git a/alice/onboarding/onboarding_client.py b/alice/onboarding/onboarding_client.py
index 175f6b5..63a2cc5 100644
--- a/alice/onboarding/onboarding_client.py
+++ b/alice/onboarding/onboarding_client.py
@@ -410,10 +410,15 @@ def supported_documents(self, user_id: str, verbose: bool = False) -> Response:
             A Response object [requests library]
         """
         print_intro("supported_documents", verbose=verbose)
-        user_token = self.auth.create_user_token(user_id).unwrap()
-        print_token("user_token", user_token, verbose=verbose)
 
-        headers = self._auth_headers(user_token)
+        if user_id:
+            token = self.auth.create_user_token(user_id).unwrap()
+            print_token("user_token", token, verbose=verbose)
+        else:
+            token = self.auth.create_backend_token().unwrap()
+            print_token("backend_token", token, verbose=verbose)
+
+        headers = self._auth_headers(token)
 
         response = requests.get(self.url + "/documents/supported", headers=headers)
         print_response(response=response, verbose=verbose)
diff --git a/examples/onboarding_with_webhooks.py b/examples/onboarding_with_webhooks.py
index 24961d5..fe2d0d2 100644
--- a/examples/onboarding_with_webhooks.py
+++ b/examples/onboarding_with_webhooks.py
@@ -43,7 +43,7 @@ def configure_webhooks(api_key: str, verbose: bool = False):
     webhooks_client.update_webhook(webhook_to_update, verbose)
 
     # Send a ping using configured webhook
-    webhooks_client.ping_webhook(webhook_id, verbose)
+    result = webhooks_client.ping_webhook(webhook_id, verbose)
 
     # Retrieve an existent Webhook
     retrieved_webhook = webhooks_client.get_webhook(webhook_id, verbose).unwrap()