> For the complete documentation index, see [llms.txt](https://support.cregis.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.cregis.com/cregis-wallet-guide/zh-tw/payment_engine/payment_configuration.md).

# 支付配置

商戶可以透過API對收銀台和支付訂單處理進行配置，詳細配置欄位請[<mark style="color:green;">**查閱API文檔**</mark>](https://developer-cn.cregis.com/quickstart)

## 收銀台配置

* 透過API指定Cregis收銀台和通知郵件的預設語言，支援以下語言選擇：
  * 英文
  * 繁體中文
  * 簡體中文
* 指定Cregis收銀台展示的支付幣種，精準控制終端客戶的支付幣種選項

## 匯率配置

* 美元穩定幣與美元之間的匯率模式，支援以下兩種選擇：
  * 實時匯率模式 - 採用市場最新匯率
  * 固定匯率模式 - 鎖定1:1兌換比例

## 支付金額允許誤差

* 透過配置上下限容差值控制支付金額的允許誤差範圍，系統將根據實際支付金額判斷訂單狀態：
  * 當 **實付金額** 大於 **應收金額** 減去 **上限容差值** 時，系統返回的支付訂單狀態為：**超額支付**
  * 當 **實付金額** 小於 **應收金額** 減去 **下限容差值** 時，系統返回的支付訂單狀態為：**部分支付**
  * 當 **實付金額** 在 **應收金額與上下限容差值內** 時，系統返回的支付訂單狀態為：**已支付**

## 支付異常處理

* **部分支付訂單處理配置**
  * **接受部分支付**：系統將自動按照結算規則結算部分支付訂單
  * **拒絕部分支付**：系統將自動啟動補款流程（具體規則請參考補款流程說明）
* **超額支付訂單處理**
  * **接受超額支付**：系統將自動按照結算規則結算超額支付訂單
  * **拒絕超額支付**：系統將自動啟動退款流程（具體規則請參考退款流程說明）

## 回調地址

* 透過API傳入指定的回調地址，Cregis會向此地址發送訂單狀態更新的webhook通知


---

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