Add all files

app/Classes/Extension/Extension.php

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+<?php
+
+namespace App\Classes\Extension;
+
+use App\Models\Extension as ModelsExtension;
+use App\Models\Gateway;
+use App\Models\Server;
+
+/**
+ * Base class for extensions
+ *
+ * @link https://docs.paymenter.org/development/extensions
+ */
+class Extension
+{
+    public function __construct(public $config = []) {}
+
+    /**
+     * Get a configuration value
+     *
+     * @param  string  $key
+     * @return mixed
+     */
+    public function config($key)
+    {
+        if (empty($this->config)) {
+            // Check from which type its being called
+            $type = debug_backtrace()[1]['class'];
+            $type = str_replace('Paymenter\Extensions\\', '', $type);
+            $type = str_replace('\\' . class_basename(static::class), '', $type);
+            if (in_array($type, ['Servers', 'Gateways'])) {
+                $type = substr($type, 0, -1);
+                $type = ($type == 'Gateway') ? Gateway::class : Server::class;
+                $this->config = $type::where('extension', class_basename(static::class))->first()->settings->pluck('value', 'key')->toArray();
+            } else {
+                $this->config = ModelsExtension::where('extension', class_basename(static::class))->first()->settings->pluck('value', 'key')->toArray();
+            }
+        }
+
+        return $this->config[$key] ?? null;
+    }
+
+    /**
+     * Get the configuration fields for the extension
+     *
+     * @link https://docs.paymenter.org
+     *
+     * @param  array  $values  The current values of the configuration (is empty on first load)
+     * @return array
+     */
+    public function getConfig($values = [])
+    {
+        return [];
+    }
+
+    /**
+     * Get the meta data for the extension
+     * E.g. name, description, version
+     *
+     * @example return [
+     *     'name' => 'Paymenter',
+     *     'description' => 'Manage and optimize your hosting business with Paymenter',
+     * ]
+     *
+     * @link https://docs.paymenter.org
+     *
+     * @return array
+     */
+    public function getMetadata()
+    {
+        return [];
+    }
+}