diff --git a/ApplicationLogger.php b/ApplicationLogger.php
new file mode 100644
index 0000000..d9ea300
--- /dev/null
+++ b/ApplicationLogger.php
@@ -0,0 +1,200 @@
+<?php
+/**
+ * Application Logger
+ * Tracks all application actions for reporting and auditing
+ */
+
+class ApplicationLogger {
+    private $logFile;
+    private $config;
+
+    public function __construct() {
+        $appConfig = require __DIR__ . '/config.php';
+        $this->config = $appConfig;
+
+        // Create logs directory if it doesn't exist
+        $logsDir = __DIR__ . '/logs';
+        if (!file_exists($logsDir)) {
+            mkdir($logsDir, 0755, true);
+        }
+
+        $this->logFile = $logsDir . '/application.log';
+    }
+
+    /**
+     * Log action with structured data
+     */
+    public function log($action, $user, $data = [], $status = 'success') {
+        $logEntry = [
+            'timestamp' => date('Y-m-d H:i:s'),
+            'action' => $action,
+            'user_email' => $user['email'] ?? 'unknown',
+            'user_name' => $user['name'] ?? 'unknown',
+            'status' => $status,
+            'data' => $data,
+            'ip_address' => $_SERVER['REMOTE_ADDR'] ?? 'unknown',
+            'user_agent' => $_SERVER['HTTP_USER_AGENT'] ?? 'unknown'
+        ];
+
+        $logLine = json_encode($logEntry) . "\n";
+
+        // Append to log file
+        file_put_contents($this->logFile, $logLine, FILE_APPEND | LOCK_EX);
+
+        // Also log to PHP error log for debugging
+        error_log('[APP LOG] ' . $action . ' - ' . $status . ' - ' . ($user['email'] ?? 'unknown'));
+
+        return $logEntry;
+    }
+
+    /**
+     * Log Master Asset Submission
+     */
+    public function logAssetSubmission($user, $boxId, $masterCampaignNumber, $dates, $status = 'success', $error = null) {
+        return $this->log('master_asset_submission', $user, [
+            'box_id' => $boxId,
+            'master_campaign_number' => $masterCampaignNumber,
+            'supply_date' => $dates['supply'] ?? null,
+            'live_date' => $dates['live'] ?? null,
+            'end_date' => $dates['end'] ?? null,
+            'error' => $error
+        ], $status);
+    }
+
+    /**
+     * Log Global to Local Transformation
+     */
+    public function logGlobalToLocal($user, $campaignNumber, $businessUnit, $inputRows, $outputFiles, $status = 'success', $error = null) {
+        return $this->log('global_to_local_transform', $user, [
+            'campaign_number' => $campaignNumber,
+            'business_unit' => $businessUnit,
+            'input_rows' => $inputRows,
+            'output_file_count' => $outputFiles,
+            'total_output_rows' => $inputRows * $outputFiles,
+            'error' => $error
+        ], $status);
+    }
+
+    /**
+     * Log Box Upload
+     */
+    public function logBoxUpload($user, $fileCount, $folderId, $status = 'success', $error = null) {
+        return $this->log('box_upload', $user, [
+            'file_count' => $fileCount,
+            'folder_id' => $folderId,
+            'error' => $error
+        ], $status);
+    }
+
+    /**
+     * Log OMG API Call
+     */
+    public function logOMGAPICall($user, $campaignNumber, $businessArea, $businessUnit, $status = 'success', $error = null) {
+        return $this->log('omg_api_lookup', $user, [
+            'campaign_number' => $campaignNumber,
+            'business_area' => $businessArea,
+            'business_unit' => $businessUnit,
+            'error' => $error
+        ], $status);
+    }
+
+    /**
+     * Get recent logs
+     */
+    public function getRecentLogs($limit = 100) {
+        if (!file_exists($this->logFile)) {
+            return [];
+        }
+
+        $lines = file($this->logFile, FILE_IGNORE_NEW_LINES);
+        $lines = array_reverse($lines);  // Most recent first
+        $lines = array_slice($lines, 0, $limit);
+
+        $logs = [];
+        foreach ($lines as $line) {
+            $log = json_decode($line, true);
+            if ($log) {
+                $logs[] = $log;
+            }
+        }
+
+        return $logs;
+    }
+
+    /**
+     * Get logs by action type
+     */
+    public function getLogsByAction($action, $limit = 100) {
+        $allLogs = $this->getRecentLogs(1000);
+
+        $filtered = array_filter($allLogs, function($log) use ($action) {
+            return $log['action'] === $action;
+        });
+
+        return array_slice(array_values($filtered), 0, $limit);
+    }
+
+    /**
+     * Get logs by user
+     */
+    public function getLogsByUser($userEmail, $limit = 100) {
+        $allLogs = $this->getRecentLogs(1000);
+
+        $filtered = array_filter($allLogs, function($log) use ($userEmail) {
+            return $log['user_email'] === $userEmail;
+        });
+
+        return array_slice(array_values($filtered), 0, $limit);
+    }
+
+    /**
+     * Generate report statistics
+     */
+    public function getStatistics($startDate = null, $endDate = null) {
+        $allLogs = $this->getRecentLogs(10000);
+
+        // Filter by date if provided
+        if ($startDate || $endDate) {
+            $allLogs = array_filter($allLogs, function($log) use ($startDate, $endDate) {
+                $timestamp = strtotime($log['timestamp']);
+                if ($startDate && $timestamp < strtotime($startDate)) return false;
+                if ($endDate && $timestamp > strtotime($endDate)) return false;
+                return true;
+            });
+        }
+
+        $stats = [
+            'total_actions' => count($allLogs),
+            'by_action' => [],
+            'by_user' => [],
+            'by_status' => [],
+            'errors' => []
+        ];
+
+        foreach ($allLogs as $log) {
+            // Count by action
+            $action = $log['action'];
+            $stats['by_action'][$action] = ($stats['by_action'][$action] ?? 0) + 1;
+
+            // Count by user
+            $user = $log['user_email'];
+            $stats['by_user'][$user] = ($stats['by_user'][$user] ?? 0) + 1;
+
+            // Count by status
+            $status = $log['status'];
+            $stats['by_status'][$status] = ($stats['by_status'][$status] ?? 0) + 1;
+
+            // Collect errors
+            if ($status === 'error') {
+                $stats['errors'][] = [
+                    'timestamp' => $log['timestamp'],
+                    'action' => $log['action'],
+                    'user' => $log['user_email'],
+                    'error' => $log['data']['error'] ?? 'Unknown error'
+                ];
+            }
+        }
+
+        return $stats;
+    }
+}
diff --git a/OMGService.php b/OMGService.php
index 38ccab8..ded33e4 100644
--- a/OMGService.php
+++ b/OMGService.php
@@ -27,6 +27,10 @@ class OMGService {
             $url = $this->baseUrl . '/getProject';
             $url .= '?project_number=' . urlencode($projectNumber);
 
+            error_log('===== OMG API CALL START =====');
+            error_log('OMG API: Base URL: ' . $this->baseUrl);
+            error_log('OMG API: Full URL: ' . $url);
+            error_log('OMG API: API Key (first 20 chars): ' . substr($this->apiKey, 0, 20) . '...');
             error_log('OMG API: Requesting project ' . $projectNumber);
 
             $ch = curl_init($url);
@@ -44,6 +48,10 @@ class OMGService {
             $curlError = curl_error($ch);
             curl_close($ch);
 
+            error_log('OMG API: Response code ' . $httpCode);
+            error_log('OMG API: Response body (first 500 chars): ' . substr($response, 0, 500));
+            error_log('===== OMG API CALL END =====');
+
             if ($curlError) {
                 return [
                     'success' => false,
diff --git a/process-csv.php b/process-csv.php
index e0347da..6161bab 100644
--- a/process-csv.php
+++ b/process-csv.php
@@ -114,8 +114,13 @@ try {
     // STAGE 4: Call OMG API
     $progress[] = ['stage' => 'omg_api', 'status' => 'processing', 'message' => 'Looking up campaign in OMG...'];
 
+    error_log('=== OMG API LOOKUP ===');
+    error_log('Campaign Number: ' . $campaignNumber);
+
     $projectResult = $omgService->getProject($campaignNumber);
 
+    error_log('OMG API Result: ' . json_encode($projectResult));
+
     if (!$projectResult['success']) {
         echo json_encode([
             'success' => false,
@@ -138,6 +143,8 @@ try {
 
     $businessArea = $omgService->getBusinessArea($projectData);
 
+    error_log('Extracted Business Area: ' . ($businessArea ?? 'NULL'));
+
     if (empty($businessArea)) {
         echo json_encode([
             'success' => false,
@@ -153,6 +160,8 @@ try {
 
     $mappingResult = $omgService->mapBusinessUnit($businessArea);
 
+    error_log('Business Unit Mapping Result: ' . json_encode($mappingResult));
+
     if (!$mappingResult['success']) {
         // Non-fatal warning - continue with "ERROR" value
         $progress[] = [