Add padding to fix base64 decode

shopping_client/shopping_client.py

@@ -104,7 +104,9 @@ class shopping_client:
             return False
 
         try:
-            payload = json.loads(base64.urlsafe_b64decode(token.split(".")[1]))
+            data = token.split(".")[1]
+            padded = data + "=" * divmod(len(token), 4)[1]
+            payload = json.loads(base64.urlsafe_b64decode(padded))
             return payload["exp"] > int(time.time()) + 10
         except KeyError:
             raise RuntimeError("Invalid JWT format")