diff --git a/web/add_provider.php b/web/add_provider.php
index 739c088..84b0b03 100644
--- a/web/add_provider.php
+++ b/web/add_provider.php
@@ -4,10 +4,13 @@
 // It uses the same Flask API as list_providers.php (http://172.25.1.105:5000).
 // When the form is submitted, it POSTs JSON to /providers.
 
+// file settings
+require_once __DIR__ . '/config.php';
+
 // Helper to call the API -------------------------------------------
 function callApi(string $method, string $path, $body = null)
 {
-    $url = 'http://127.0.0.1:5000' . $path;
+    $url = BASE_API_URL . $path;
     $ch  = curl_init($url);
     curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $method);
     curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
diff --git a/web/config.php b/web/config.php
new file mode 100644
index 0000000..89b8151
--- /dev/null
+++ b/web/config.php
@@ -0,0 +1,6 @@
+// config.php
+<?php
+// Base URL for the API
+define('BASE_API_URL', 'http://127.0.0.1:5000');
+
+?>
diff --git a/web/edit_provider.php b/web/edit_provider.php
index b7ee0eb..a8e0d78 100644
--- a/web/edit_provider.php
+++ b/web/edit_provider.php
@@ -5,6 +5,9 @@
 // This page allows editing a provider's details.
 // It expects a provider id passed via the query string: ?id=123
 
+// file settings
+require_once __DIR__ . '/config.php';
+
 $provider_id = isset($_GET['id']) ? intval($_GET['id']) : 0;
 if ($provider_id <= 0) {
     echo '<h1>Error</h1>' .
@@ -13,7 +16,7 @@ if ($provider_id <= 0) {
 }
 
 // API base URL
-$api_base = 'http://127.0.0.1:5000';
+$url = BASE_API_URL . $path;
 
 // Handle form submission
 if ($_SERVER['REQUEST_METHOD'] === 'POST') {
diff --git a/web/list_providers.php b/web/list_providers.php
index 14c594d..811a8de 100644
--- a/web/list_providers.php
+++ b/web/list_providers.php
@@ -4,10 +4,13 @@
 // It expects the Flask API to be reachable at http://127.0.0.1:5000
 // The API endpoint for providers is /providers.
 
+// file settings
+require_once __DIR__ . '/config.php';
+
 // --- Helper to call the API -------------------------------------------
 function callApi(string $method, string $path, $body = null)
 {
-    $url = 'http://127.0.0.1:5000' . $path;
+    $url = BASE_API_URL . $path;
     $ch  = curl_init($url);
     curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $method);
     curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
diff --git a/web/settings.php b/web/settings.php
index 70e6eac..7c63cf0 100644
--- a/web/settings.php
+++ b/web/settings.php
@@ -4,11 +4,14 @@
 // It supports updating existing settings via PUT and creating a single new setting via POST.
 // The design follows the pattern used in list_providers.php.
 
+// file settings
+require_once __DIR__ . '/config.php';
+
 // --- Helper to call the Flask API -------------------------------------------
 function callApi(string $method, string $path, $body = null)
 {
     // API base URL – update if your API is hosted elsewhere
-    $url = 'http://127.0.0.1:5000' . $path;
+    $url = BASE_API_URL . $path;
     $ch  = curl_init($url);
     curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $method);
     curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);