fix(ns): class_exists() must use FQCN after PSR-4

Bare class_exists('Balance') looks up global Balance, always false
under AKSRT\* namespaces → REST 403 on balance exchange and friends.
Rewrite string checks to AKSRT\{Domain}\{Class}.

src/AKSRT/Payment/AfterSale.php

@@ -137,7 +137,7 @@ class AfterSale {
         $items = $wpdb->get_results($wpdb->prepare($sql, $params), ARRAY_A);
         $items = array_map([$this, 'decorate_record'], (array) $items);
 
-        if ($include_order_context && !empty($items) && class_exists('OrderRepository')) {
+        if ($include_order_context && !empty($items) && class_exists('AKSRT\\Payment\\OrderRepository')) {
             $contexts = OrderRepository::get_instance()->get_admin_order_context_map(array_column($items, 'order_number'));
             foreach ($items as &$item) {
                 $item['order_context'] = $contexts[(string) ($item['order_number'] ?? '')] ?? [];
@@ -174,7 +174,7 @@ class AfterSale {
             return null;
         }
 
-        $record['order_context'] = class_exists('OrderRepository')
+        $record['order_context'] = class_exists('AKSRT\\Payment\\OrderRepository')
             ? OrderRepository::get_instance()->get_admin_order_context((string) ($record['order_number'] ?? ''))
             : [];
 
@@ -561,7 +561,7 @@ class AfterSale {
     }
 
     private function sync_order_status(array $record, string $new_status, string $note = ''): void {
-        if (!class_exists('OrderRepository') || !class_exists('Order')) {
+        if (!class_exists('AKSRT\\Payment\\OrderRepository') || !class_exists('AKSRT\\Payment\\Order')) {
             return;
         }
 

src/AKSRT/Payment/ChargeCard.php

@@ -330,7 +330,7 @@ class ChargeCard {
 
         if (!$this->mark_used_cas($card_id, $user_id, $order_number)) {
             // Race lost.
-            if (class_exists('Order')) {
+            if (class_exists('AKSRT\\Payment\\Order')) {
                 Order::get_instance()->update_status($order_number, Order::STATUS_CANCELLED, [
                     'note' => __('卡密已被使用，订单取消', 'aksrt'),
                 ]);
@@ -343,7 +343,7 @@ class ChargeCard {
             return $fulfill;
         }
 
-        if (class_exists('Order')) {
+        if (class_exists('AKSRT\\Payment\\Order')) {
             Order::get_instance()->update_status($order_number, Order::STATUS_PAID, [
                 'payment_method'         => 'card_pass',
                 'payment_transaction_id' => 'card_pass_' . $card_id,
@@ -502,7 +502,7 @@ class ChargeCard {
      * @param array<string,mixed> $meta
      */
     private function create_redeem_order(int $user_id, string $type, array $meta, int $card_id, string $password): string {
-        if (!class_exists('OrderRepository') || !class_exists('\AKSRT\Core\DomainModel')) {
+        if (!class_exists('AKSRT\\Payment\\OrderRepository') || !class_exists('\AKSRT\Core\DomainModel')) {
             return 'CARD' . $card_id . '_' . time();
         }
 
@@ -536,7 +536,7 @@ class ChargeCard {
             'product_id'     => $product_id,
             'amount'         => $amount,
             'currency'       => $currency,
-            'status'         => class_exists('Order') ? Order::STATUS_PENDING : 'pending',
+            'status'         => class_exists('AKSRT\\Payment\\Order') ? Order::STATUS_PENDING : 'pending',
             'payment_method' => 'card_pass',
             'note'           => is_string($note) ? $note : '',
             'expires_at'     => gmdate('Y-m-d H:i:s', time() + 30 * MINUTE_IN_SECONDS),

src/AKSRT/Payment/CreatorRevenue.php

@@ -26,7 +26,7 @@ class CreatorRevenue {
          * Whether creator revenue settlement is enabled.
          */
         private function is_enabled(): bool {
-            if (!class_exists('Revenue') || !class_exists('\AKSRT\Settings\Settings')) {
+            if (!class_exists('AKSRT\\Payment\\Revenue') || !class_exists('\AKSRT\Settings\Settings')) {
                 return false;
             }
             $settings = \AKSRT\Settings\Settings::get_payment_revenue_settings();

src/AKSRT/Payment/Gateway.php

@@ -212,7 +212,7 @@ class Gateway {
      */
     public function complete_order(string $gateway_id, array $verify): bool {
         $order_number = sanitize_text_field((string) ($verify['order_number'] ?? ''));
-        if ($order_number === '' || !class_exists('OrderRepository')) {
+        if ($order_number === '' || !class_exists('AKSRT\\Payment\\OrderRepository')) {
             return false;
         }
 

src/AKSRT/Payment/OrderRepositoryAdmin.php

@@ -63,10 +63,10 @@ trait OrderRepositoryAdmin {
         }
 
         $resolved_order_numbers = array_keys($orders);
-        $shipping_map = class_exists('Shipping')
+        $shipping_map = class_exists('AKSRT\\Payment\\Shipping')
             ? Shipping::get_instance()->get_summary_map($resolved_order_numbers)
             : [];
-        $after_sale_map = class_exists('AfterSale')
+        $after_sale_map = class_exists('AKSRT\\Payment\\AfterSale')
             ? AfterSale::get_instance()->get_summary_map($resolved_order_numbers)
             : [];
 
@@ -509,7 +509,7 @@ trait OrderRepositoryAdmin {
             'summary' => [
                 'order_number' => (string) ($order['order_number'] ?? ''),
                 'status' => $status,
-                'status_label' => class_exists('Order') ? (Order::get_valid_statuses()[$status] ?? $status) : $status,
+                'status_label' => class_exists('AKSRT\\Payment\\Order') ? (Order::get_valid_statuses()[$status] ?? $status) : $status,
                 'amount' => $amount,
                 'currency_symbol' => '¥',
                 'created_at' => (string) ($order['created_at'] ?? ''),

src/AKSRT/Payment/Shipping.php

@@ -123,7 +123,7 @@ class Shipping {
         $items = $wpdb->get_results($wpdb->prepare($sql, $params), ARRAY_A);
         $items = array_map([$this, 'decorate_record'], (array) $items);
 
-        if ($include_order_context && !empty($items) && class_exists('OrderRepository')) {
+        if ($include_order_context && !empty($items) && class_exists('AKSRT\\Payment\\OrderRepository')) {
             $contexts = OrderRepository::get_instance()->get_admin_order_context_map(array_column($items, 'order_number'));
             foreach ($items as &$item) {
                 $item['order_context'] = $contexts[(string) ($item['order_number'] ?? '')] ?? [];
@@ -172,7 +172,7 @@ class Shipping {
             return null;
         }
 
-        $record['order_context'] = class_exists('OrderRepository')
+        $record['order_context'] = class_exists('AKSRT\\Payment\\OrderRepository')
             ? OrderRepository::get_instance()->get_admin_order_context((string) ($record['order_number'] ?? ''))
             : [];
 

src/AKSRT/Payment/ShippingPart1.php

@@ -10,7 +10,7 @@ defined('ABSPATH') || exit;
 trait ShippingPart1 {
 
     private function send_shipping_notification(string $order_number, string $carrier, string $tracking_no, string $note = ''): void {
-        if (!class_exists('OrderRepository')) {
+        if (!class_exists('AKSRT\\Payment\\OrderRepository')) {
             return;
         }
 
@@ -117,7 +117,7 @@ trait ShippingPart1 {
     }
 
     private function sync_order_status(string $order_number, string $shipping_status, string $note = ''): void {
-        if ($order_number === '' || !class_exists('OrderRepository') || !class_exists('Order')) {
+        if ($order_number === '' || !class_exists('AKSRT\\Payment\\OrderRepository') || !class_exists('AKSRT\\Payment\\Order')) {
             return;
         }