feat(events): harden registration checkout lifecycle

apps/payments/api/schemas.py

@@ -71,21 +71,44 @@ class PaymentDetailOut(Schema):
     amount: int
     status: str
     verified_at: str | None = None
+    gateway_paid_at: str | None = None
+    refund_status: Literal["none", "pending", "succeeded", "manual_review"] = "none"
+    refund_attempts: int = 0
+    refund_last_attempt_at: str | None = None
+    refund_next_attempt_at: str | None = None
+    refund_reference: str | None = None
+    refund_last_error: str | None = None
+    verification_state: Literal[
+        "awaiting_verification",
+        "checking",
+        "retry_scheduled",
+        "manual_review",
+        "verified",
+        "failed",
+        "canceled",
+    ]
+    verification_attempts: int
+    last_verification_at: str | None = None
+    next_verification_at: str | None = None
+    manual_review_at: str | None = None
     event: dict
 
 
 class UserPaymentEventSchema(Schema):
+    id: int
     title: str
     slug: str
     image_url: Optional[str] = None
 
 
 class UserPaymentSchema(Schema):
+    payment_id: int
     event: UserPaymentEventSchema
     base_amount: int
     discount_amount: int
     amount: int
     status: Literal["initiated", "pending", "paid", "failed", "canceled"]
+    refund_status: Literal["none", "pending", "succeeded", "manual_review"] = "none"
     created_at: datetime
     paid_at: Optional[datetime] = None