Add ZarinPal e-payment and related checkout/search fixes.

Business settings can store ZarinPal merchant credentials, and the payment registry can initiate and verify ZarinPal alongside Mellat.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/business-settings/business-settings.types.ts

@@ -58,8 +58,17 @@ export type MellatGatewaySettings = {
   password: string;
 };
 
+/** ZarinPal merchant credentials. */
+export type ZarinpalGatewaySettings = {
+  enabled: boolean;
+  /** Merchant code from the ZarinPal panel. */
+  merchantId: string;
+  /** When true, use sandbox.zarinpal.com endpoints. */
+  sandbox: boolean;
+};
+
 /**
- * Placeholder for gateways not yet wired (SEP, Snapp Pay, DigiPay, Zarinpal).
+ * Placeholder for gateways not yet wired (SEP, Snapp Pay, DigiPay).
  * Credential fields are added when each adapter ships.
  */
 export type StubGatewaySettings = {
@@ -71,7 +80,7 @@ export type PaymentGatewaysSettings = {
   sep: StubGatewaySettings;
   snappay: StubGatewaySettings;
   digipay: StubGatewaySettings;
-  zarinpal: StubGatewaySettings;
+  zarinpal: ZarinpalGatewaySettings;
 };
 
 /** Online e-payment (website checkout). */
@@ -192,6 +201,12 @@ export const DEFAULT_STUB_GATEWAY_SETTINGS: StubGatewaySettings = {
   enabled: false,
 };
 
+export const DEFAULT_ZARINPAL_GATEWAY_SETTINGS: ZarinpalGatewaySettings = {
+  enabled: false,
+  merchantId: '',
+  sandbox: false,
+};
+
 export const DEFAULT_EPAYMENT_SETTINGS: EPaymentSettings = {
   enabled: false,
   defaultGateway: null,
@@ -200,7 +215,7 @@ export const DEFAULT_EPAYMENT_SETTINGS: EPaymentSettings = {
     sep: { ...DEFAULT_STUB_GATEWAY_SETTINGS },
     snappay: { ...DEFAULT_STUB_GATEWAY_SETTINGS },
     digipay: { ...DEFAULT_STUB_GATEWAY_SETTINGS },
-    zarinpal: { ...DEFAULT_STUB_GATEWAY_SETTINGS },
+    zarinpal: { ...DEFAULT_ZARINPAL_GATEWAY_SETTINGS },
   },
 };