方向：Inbound（QI Tech / 支付基础设施 → BNPL WL）。 合作伙伴不直接调用此端点。

Webhook endpoint for receiving refund status change notifications.

This is triggered when a refund transitions between states.

Use this to track refund progress asynchronously, especially useful when a refund request times out.

Common status transitions:

• PENDING -> LIMIT_RESTORED: 客户信用额度已恢复，退款转账仍在处理中

• LIMIT_RESTORED -> COMPLETED: Refund processed successfully

• PENDING -> FAILED: Refund processing failed

• PENDING -> ACTION_REQUIRED: Refund needs partner action (e.g., invalid PIX key — collect a new one from the customer)

• ACTION_REQUIRED -> PENDING: Partner resubmitted corrected data, refund is being retried