Build a VPN app for iOS and Android -- 2

I need a VPN app built for iOS and Android that has ADmob/FB Ads integrated, along with paid subscription features, and complete backend portal. App configuration and upload to store.
Some of the key features required are,
- Simple UI with one click connect and disconnect with Auto Server selection and Manual options
- 256 Bit AES algorithm/HMAC SHA256 hash authentication
- Protocols, IKEv2, OpenVPN, WireGuard with ChaCha20 cipher
- Servers configuration and setup
- Auto Kill Switch
- Load Balancing
- Usage Statistics
- DNS/IPv6 Leak Protection
- VPN Obfuscation feature
- Double VPN server (multi hop) option