| Parameter Name | Type | Description | Required |
|---|---|---|---|
| Action | String | The corresponding API instruction name | ✓ |
| PublicKey | String | User's public key, which can be obtained from the PICPIK User Center (opens in a new tab) | ✓ |
| Signature | String | User's signature generated based on the public key and API instruction, see Signature for details | ✓ |
| request_uuid | String | Request UUID, randomly generated by using the UUID generation method. This parameter can be utilized to manage the requests of your business and clients. |