# API Specification Common Rules

**Interface call frequency limit:**  Frequency limit for each IP is 100 times per second.

### Protocol Rules 

The following specifies the rules for calling the API when accessing CCPayment

| Rule                       | Description                                                      |
| -------------------------- | ---------------------------------------------------------------- |
| Transfer Mode              | Use HTTPS for secure transactions.                               |
| Submit Mode                | POST, depends on the API.                                        |
| Data Format (content-type) | Data submitted and response are both in application/json format. |
| Char Encoding              | Use UTF-8 character encoding.                                    |
| Signature Algorithm        | SHA-256                                                          |

### Request Header

<table><thead><tr><th width="170" align="center">Request Header</th><th width="79" align="center">Type</th><th width="104" align="center">Required</th><th width="143">Value</th><th width="351">Description</th></tr></thead><tbody><tr><td align="center">content-type</td><td align="center">string</td><td align="center">Y</td><td></td><td>application/json</td></tr><tr><td align="center">Appid</td><td align="center">string</td><td align="center">Y</td><td></td><td>Merchant's unique credential. Find it on the <a href="https://admin.ccpayment.com/developer/config">Developer page</a>.</td></tr><tr><td align="center">Timestamp</td><td align="center">string</td><td align="center">Y</td><td>1677152720</td><td>Timestamp in seconds (10-digit) expires in 2 minutes.</td></tr><tr><td align="center">Sign</td><td align="center">string</td><td align="center">Y</td><td>871f0223c66ea72435208d03603a0cb00b90f6ac4a4ba725d00164d967e291f6</td><td>SHA-256 (APPID + APP Secret +timestamp+<mark style="color:red;"><strong>body (json string)</strong></mark>). <a href="https://doc.ccpayment.com/~/changes/HSMg9pcC4k6HIczMjOvx/ccpayment-for-developer/to-get-started/signature">Signature guide</a>.</td></tr></tbody></table>

### Payment API Error Code

{% content-ref url="/pages/x1dzF0Y0we0ugctTmCMD" %}
[Error Code](/ccpayment-v1.0-api/resources-document/error-code.md)
{% endcontent-ref %}


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