Http status code beginning with the number 4 signifies that there was an error on the client side.
| Code | Description |
|---|---|
400 | The request was invalid or cannot be otherwise served. An accompanying error message will explain further. Requests without all required parameters or have invalid values are considered invalid and will yield this response. |
401 | Invalid Access ID or user token. An accompanying error message will explain further. And most of the time an additional internal error code will also be included. |
403 | The request is understood, but it has been refused or access is not allowed. An accompanying error message will explain why. This is usually caused by an invalid API key, incorrect request signature, or access is denied. |
404 | A session or a transaction is not found. |