feat: implement BaseIntegrationService and TelepagosIntegrationService with integration handling and header generation

app/Domains/Integration/Services/TelepagosIntegrationService.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace App\Domains\Integration\Services;
+
+use Exception;
+
+class TelepagosIntegrationService extends BaseIntegrationService
+{
+    /**
+     * TelepagosIntegrationService constructor.
+     *
+     * @param string $integrationCode
+     */
+    public function __construct(string $integrationCode = 'telepagos')
+    {
+        $this->integrationCode = $integrationCode;
+    }
+
+    /**
+     * Get the headers for Telepagos integration.
+     *
+     * @return array
+     * @throws Exception
+     */
+    public function getHeaders(): array
+    {
+        if (!$this->tenantIntegration) {
+            throw new Exception("Tenant integration is not loaded. Call forTenant() first.");
+        }
+
+        $username = $this->getIntegrationSetting('username');
+        $password = $this->getIntegrationSetting('password');
+
+        if (empty($username) || empty($password)) {
+            throw new Exception("Missing username or password in Telepagos integration settings.");
+        }
+
+        return [
+            'Authorization' => 'Basic ' . base64_encode($username . ':' . $password),
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
+    }
+}