# HTTP Status Code

> After you initiate a call to PayKKa's API，you will receive a response from PayKKa.
Our API accepts request payloads in JSON format and returns standard HTTP status codes along with JSON-formatted response content.
You can use your preferred HTTP library to handle full request and response cycles.


| HTTP Code  | Description |
|  --- | --- |
| `200` | Request processed successfully. Indicates that PayKKa has received the request (only means the request succeeded; business-level exceptions may still occur). |
| `400` | Business exception occurred，such as parameter format errors or validation failures. Indicates that PayKKa could not understand the request. It is recommended to review the request parameters and retry. |
| `401` | Unauthorized. Please ensure that a correct and valid authentication token is provided. |
| `403` | Forbidden. You do not have permission to access the requested resource. Please do not retry repeatedly. Contact PayKKa support for more details. |
| `404` | Resource not found. |
| `429` | Request rate limit exceeded. |
| `500` | System error occurred. |