fix: correctly work with telecart customers without usernames

module/oc_telegram_shop/upload/oc_telegram_shop/database/migrations/20260103000000_fill_empty_usernames_in_telecart_customers.php

@@ -0,0 +1,16 @@
+<?php
+
+use Openguru\OpenCartFramework\Migrations\Migration;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        $sql = <<<SQL
+update telecart_customers
+set username = telegram_user_id
+where username is null
+SQL;
+        $this->database->statement($sql);
+    }
+};
+

module/oc_telegram_shop/upload/oc_telegram_shop/src/Services/TelecartCustomerService.php

@@ -71,7 +71,7 @@ class TelecartCustomerService
     {
         return [
             'telegram_user_id' => $telegramUserId,
-            'username' => Arr::get($telegramUserData, 'username'),
+            'username' => Arr::get($telegramUserData, 'username', $telegramUserId),
             'first_name' => Arr::get($telegramUserData, 'first_name'),
             'last_name' => Arr::get($telegramUserData, 'last_name'),
             'language_code' => Arr::get($telegramUserData, 'language_code'),