feat(pay): 添加 FIUU支付回调处理功能

KKSU

2025-02-08 d2e20554025955f4c8e831d1969ca060997aaf71

 src/main/java/cc/mrbird/febs/pay/util/FiuuUtil.java

@@ -66,8 +66,8 @@
         Map<String, String> params = new LinkedHashMap<>();
         params.put("RefundType", "P"); // P: Partial Refund, F: Full Refund
         params.put("MerchantID", MERCHANT_ID);
         params.put("RefID", "2025020611124868512_RITEM42432121"); // 商户唯一退款ID
         params.put("TxnID", "2685352601"); // Fiuu原始交易ID
         params.put("RefID", "2025020611124868512_RITEM2687855760"); // 商户唯一退款ID
         params.put("TxnID", "2687855760"); // Fiuu原始交易ID
         params.put("Amount", "1.00"); // 退款金额

         // 生成签名