feat(payment): add payment detail endpoint and update payment model with order_id and patient_name

feat(appointment): enhance appointment detail page with time formatting and additional info
fix(payment): update payment query to fetch from the correct endpoint and adjust response structure
docs(api): add search parameter to payments API documentation and detail response structure
test(payment): add unit test for MellatGateway to verify null credentials handling

tests/Payment/MellatGatewayTest.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Tests\Payment;
+
+use App\Config\Repository\SiteConfigRepository;
+use App\Payment\Gateway\MellatGateway;
+use PHPUnit\Framework\TestCase;
+use Psr\Log\LoggerInterface;
+use Symfony\Contracts\HttpClient\HttpClientInterface;
+
+class MellatGatewayTest extends TestCase
+{
+  public function testConstructorAcceptsNullCredentials(): void
+  {
+    $httpClient = $this->createMock(HttpClientInterface::class);
+    $configRepo = $this->createMock(SiteConfigRepository::class);
+    $logger = $this->createMock(LoggerInterface::class);
+
+    $configRepo->method('get')->willReturn(null);
+
+    $gateway = new MellatGateway($httpClient, $configRepo, $logger, null, null, null);
+
+    $this->assertFalse($gateway->isConfigured());
+  }
+}