fix(payments): make checkout attempts idempotent and reconcilable

apps/payments/api/schemas.py

@@ -2,6 +2,7 @@ from typing import Literal, Optional
 
 from ninja import Schema
 from datetime import datetime
+from uuid import UUID
 
 
 class DiscountCodeSchema(Schema):
@@ -47,16 +48,22 @@ class CreatePaymentIn(Schema):
     discount_code: str | None = None
     mobile: str | None = None
     email:  str | None = None
+    idempotency_key: UUID | None = None
 
 
 class CreatePaymentOut(Schema):
     start_pay_url: str | None = None
     authority: str | None = None
+    payment_id: int | None = None
+    idempotency_key: UUID | None = None
+    status: Literal["initiated", "pending", "paid", "failed", "canceled"]
     base_amount: int
     discount_amount: int
     amount: int
 
 class PaymentDetailOut(Schema):
+    payment_id: int
+    event_id: int
     ref_id: str | None = None
     authority: str | None = None
     base_amount: int