feat(purchase-status): remove mock data and implement actual purchase status fetching

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

@@ -47,4 +47,14 @@ export class CheckoutService {
     }
     return response.data;
   }
+
+  async getPurchase(tenantCode: string, purchaseId: string | number): Promise<{ payment_status: string }> {
+    const response = await firstValueFrom(
+      this.http.get<{ data: { payment_status: string } }>(`${environment.url}tenants/${tenantCode}/compras/${purchaseId}`)
+    );
+    if (!response?.data) {
+      throw new Error('Error al obtener la compra.');
+    }
+    return response.data;
+  }
 }