update pay promo

app.py

@@ -3733,6 +3733,7 @@ def get_invoice_available_orders():
     """获取可开票订单列表（已支付且未申请开票的订单）"""
     try:
         user_id = session['user_id']
+        print(f"[发票API] 获取可开票订单 - 用户ID: {user_id}")
 
         # 查询已支付的订单
         paid_orders = PaymentOrder.query.filter_by(
@@ -3740,6 +3741,10 @@ def get_invoice_available_orders():
             status='paid'
         ).order_by(PaymentOrder.paid_at.desc()).all()
 
+        print(f"[发票API] 查询到已支付订单数: {len(paid_orders)}")
+        for po in paid_orders:
+            print(f"[发票API]   订单ID={po.id}, 订单号={po.order_no}, 金额={po.amount}, 支付时间={po.paid_at}")
+
         available_orders = []
         for order in paid_orders:
             # 检查该订单是否已申请过发票