Build VPN app, publish it IOS app, I need to retain onership of app., must work on the appstore. be downloadable from the app store.

Hello, I currently have my VPN android and windows app and website connected to WHMCS. I have access to the OpenVPN files with the IPs of the servers. I need a new IOS app that uses OpenVPN and can connect quickly to the closest server. Would like to have leak protection (on/off), so if the VPN disconnects you lose network connection, also leakproof DNS. the ability to manually connect to any country and server located. I would like ownership of the app, needs to be listed in the app store, and must include publishing services. I sue this company. https://clients.vpnshop.co.uk/cart.php?gid=2 .