Added Etsy Auth

assets/php/etsyData/callbackEtsy.php

@@ -0,0 +1,33 @@
+<?php
+include '/mnt/www-live/TechOdyssey_Designs_Dashboard/assets/php/session_check.php';
+require '/mnt/www-live/TechOdyssey_Designs_Dashboard/assets/php/envLoader.php';  // Load envLoader from php/
+loadEnv(__DIR__ . '/../../../.env');  // Go up three levels to find .env
+
+session_start();
+
+if ($_GET['state'] !== $_SESSION['oauth_state']) {
+    die('Invalid state. Possible CSRF attack.');
+}
+
+$code = $_GET['code'];
+
+$clientId = $_ENV['ETSY_KEYSTRING'];
+$clientSecret = $_ENV['ETSY_SECRET'];
+$redirectUri = $_ENV['ETSY_REDIRECT_URI'];
+
+$data = [
+    'grant_type' => 'authorization_code',
+    'client_id' => $clientId,
+    'client_secret' => $clientSecret,
+    'code' => $code,
+    'redirect_uri' => $redirectUri
+];
+
+$ch = curl_init("https://api.etsy.com/v3/public/oauth/token");
+curl_setopt($ch, CURLOPT_POST, true);
+curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data));
+$response = curl_exec($ch);
+$tokens = json_decode($response, true);
+
+file_put