My OnlineShop - eCommerce Solution PHP Script with Android Application got rejected can anyone let me know the solution for this

My OnlineShop - eCommerce Solution PHP Script with Android Application got rejected can anyone let me know the solution for this so that this can be accepted.

Website URL : https://www.onlineshop.ticketslastminute.co.uk/
Admin URL : https://www.onlineshop.ticketslastminute.co.uk/admin/login
Username : admin@admin.com
Password : admin.