> For the complete documentation index, see [llms.txt](https://useepay.gitbook.io/developer/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://useepay.gitbook.io/developer/reference/api-reference-xin-yong-ka.md).

# API Reference（信用卡）

## 功能

UseePay支持以下功能

* 支付
* 预授权
* 预授权完成
* 预授权撤销
* 退款
* 查询