feat(checkout): show transfer candidate issue

src/app/core/services/checkout.service.ts

@@ -74,6 +74,28 @@ export interface PurchaseStatusResponse {
   expires_at: string | null;
   expires_in_seconds: number | null;
   server_time: string;
+  payment_verification?: PurchasePaymentVerificationResponse;
+}
+
+export type PurchasePaymentCandidateReason =
+  | 'ambiguous_exact_match'
+  | 'exact_dni_near_amount'
+  | 'exact_amount_different_dni';
+
+export interface PurchasePaymentCandidatePrimaryResponse {
+  reason: PurchasePaymentCandidateReason;
+  payment_amount: string;
+  purchase_amount: string;
+  amount_difference: string;
+  confidence: 'exact' | 'high' | 'medium';
+  detected_at: string | null;
+}
+
+export interface PurchasePaymentVerificationResponse {
+  status: 'pending' | 'candidate';
+  candidate_count: number;
+  primary: PurchasePaymentCandidatePrimaryResponse | null;
+  reasons: PurchasePaymentCandidateReason[];
 }
 
 export interface PurchaseSummaryResponse extends PurchaseStatusResponse {