Add PayPal webhook handler and marketing styles

- Implemented PayPal webhook for handling payment notifications, including signature verification and transaction updates.
- Created invoice generation and license management for software upgrades upon successful payment.
- Added comprehensive logging for debugging purposes.
- Introduced new CSS styles for the marketing file management system, including layout, toolbar, breadcrumb navigation, search filters, and file management UI components.

api/v2/get/marketing_files.php

@@ -0,0 +1,155 @@
+<?php
+defined($security_key) or exit;
+
+//------------------------------------------
+// Marketing Files
+//------------------------------------------
+
+//Connect to DB
+$pdo = dbConnect($dbname);
+
+//SoldTo is empty
+if (empty($partner->soldto) || $partner->soldto == ''){$soldto_search = '%';} else {$soldto_search = '-%';}
+
+//default whereclause
+$whereclause = '';
+
+// For testing, disable account hierarchy filtering
+// list($whereclause,$condition) = getWhereclauselvl2("",$permission,$partner,'get');
+
+//NEW ARRAY
+$criterias = [];   
+$clause = '';
+
+//Check for $_GET variables and build up clause
+if(isset($get_content) && $get_content!=''){    
+    //GET VARIABLES FROM URL
+    $requests = explode("&", $get_content);     
+    //Check for keys and values
+    foreach ($requests as $y){
+        $v = explode("=", $y);
+        //INCLUDE VARIABLES IN ARRAY
+        $criterias[$v[0]] = $v[1]; 
+    
+        if ($v[0] == 'page' || $v[0] =='p' || $v[0] =='totals' || $v[0] =='list' || $v[0] == 'action' || $v[0] =='success_msg' || $v[0] == '_t'){
+        //do nothing
+        } 
+        elseif ($v[0] == 'folder_id') {
+            if ($v[1] === 'null' || $v[1] === '') {
+                $clause .= ' AND folder_id IS NULL';
+            } else {
+                $clause .= ' AND folder_id = :folder_id';
+            }
+        }
+        elseif ($v[0] == 'search') {
+            $clause .= ' AND (title LIKE :search OR original_filename LIKE :search)'; 
+        }
+        elseif ($v[0] == 'tag') {
+            $clause .= ' AND EXISTS (SELECT 1 FROM marketing_file_tags ft JOIN marketing_tags t ON ft.tag_id = t.id WHERE ft.file_id = mf.id AND t.tag_name = :tag)';
+        }
+        elseif ($v[0] == 'file_type') {
+            $clause .= ' AND file_type = :file_type';
+        }
+        else {
+            // Ignore unknown parameters
+        }
+    }
+    if ($whereclause == '' && $clause !=''){
+        $whereclause = 'WHERE '.substr($clause, 4);
+    } else {
+        $whereclause .= $clause;
+    }
+}
+
+//Set page 
+$pagina = 1;
+if(isset($criterias['p']) && $criterias['p'] !='') {
+    $pagina = $criterias['p'];
+}
+
+//Set limit
+$limit = 50;
+if(isset($criterias['limit']) && $criterias['limit'] !='') {
+    $limit = intval($criterias['limit']);
+}
+$offset = ($pagina - 1) * $limit;
+
+//check for totals call
+if(isset($criterias['totals'])){ 
+    $sql = 'SELECT COUNT(*) as found FROM marketing_files mf '.$whereclause.' ';
+    $stmt = $pdo->prepare($sql);
+    
+    // Bind parameters
+    if (!empty($criterias)) {
+        foreach ($criterias as $key => $value) {
+            if ($key !== 'totals' && $key !== 'page' && $key !== 'p' && $key !== 'limit' && $key !== 'action') {
+                if ($key == 'search') {
+                    $stmt->bindValue(':'.$key, '%'.$value.'%');
+                } elseif ($key == 'folder_id' && ($value === 'null' || $value === '')) {
+                    continue;
+                } else {
+                    $stmt->bindValue(':'.$key, $value);
+                }
+            }
+        }
+    }
+    
+    $stmt->execute();
+    $found = $stmt->fetchColumn();
+    echo $found; 
+    exit;  
+}
+
+// Main query
+$sql = "SELECT 
+    mf.*,
+    GROUP_CONCAT(mt.tag_name) as tags
+FROM marketing_files mf 
+LEFT JOIN marketing_file_tags mft ON mf.id = mft.file_id 
+LEFT JOIN marketing_tags mt ON mft.tag_id = mt.id
+" . $whereclause . " 
+GROUP BY mf.id
+ORDER BY mf.created DESC
+LIMIT " . $limit . " OFFSET " . $offset;
+
+$stmt = $pdo->prepare($sql);
+
+// Bind parameters
+if (!empty($criterias)) {
+    foreach ($criterias as $key => $value) {
+        if ($key !== 'totals' && $key !== 'page' && $key !== 'p' && $key !== 'limit') {
+            if ($key == 'search') {
+                $stmt->bindValue(':'.$key, '%'.$value.'%');
+            } elseif ($key == 'folder_id' && ($value === 'null' || $value === '')) {
+                continue;
+            } else {
+                $stmt->bindValue(':'.$key, $value);
+            }
+        }
+    }
+}
+
+$stmt->execute();
+$marketing_files = $stmt->fetchAll(PDO::FETCH_ASSOC);
+
+// Process each file
+foreach ($marketing_files as &$file) {
+    // Process tags
+    $file['tags'] = $file['tags'] ? explode(',', $file['tags']) : [];
+    
+    // Format file size
+    $bytes = $file['file_size'];
+    if ($bytes >= 1073741824) {
+        $file['file_size_formatted'] = number_format($bytes / 1073741824, 2) . ' GB';
+    } elseif ($bytes >= 1048576) {
+        $file['file_size_formatted'] = number_format($bytes / 1048576, 2) . ' MB';
+    } elseif ($bytes >= 1024) {
+        $file['file_size_formatted'] = number_format($bytes / 1024, 2) . ' KB';
+    } else {
+        $file['file_size_formatted'] = $bytes . ' B';
+    }
+}
+
+// Return result
+echo json_encode($marketing_files, JSON_UNESCAPED_UNICODE);
+exit;