Fix: Use EFT ID as filename for POP uploads instead of random filename

- Changed from random filename to eft_id.pdf format for proof of payment files
- Updated sendPOP() and auditLog() calls to use new filename variable

src/processors/process_signature.php

@@ -1,4 +1,10 @@
 <?php
+ob_start(); // Start output buffering
+session_start();
+
+// Set JSON response header BEFORE any other output
+header('Content-Type: application/json');
+
 $rootPath = dirname(dirname(__DIR__));
 require_once($rootPath . "/src/config/env.php");
 require_once($rootPath . "/src/config/session.php");
@@ -6,6 +12,7 @@ require_once($rootPath . "/src/config/connection.php");
 require_once($rootPath . "/src/config/functions.php");
 
 if (!isset($_SESSION['user_id'])) {
+    ob_end_clean();
     die(json_encode(['status' => 'error', 'message' => 'User not logged in']));
 }
 
@@ -53,21 +60,25 @@ if (isset($_POST['signature'])) {
             $paymentStatus = checkMembershipPaymentStatus($user_id) ? 'PAID' : 'NOT_PAID';
 
             // Respond with the appropriate redirect URL based on the payment status
+            ob_end_clean();
             echo json_encode([
                 'status' => 'success',
                 'message' => 'Signature saved successfully!',
                 'paymentStatus' => $paymentStatus // Send payment status
             ]);
         } else {
+            ob_end_clean();
             echo json_encode(['status' => 'error', 'message' => 'Database update failed']);
         }
 
         $stmt->close();
         $conn->close();
     } else {
+        ob_end_clean();
         echo json_encode(['status' => 'error', 'message' => 'Failed to save signature']);
     }
 } else {
+    ob_end_clean();
     echo json_encode(['status' => 'error', 'message' => 'Signature not provided']);
 }