unfortunately I can't find an executable addon on the net to integrate CoinPayments.net into our system. it should be integrated as an additional paygate.
Hey, we've made a free additon that's also open-sourced on GitHub allows you to do the same but with BTCPay Server, which is free and self-hosted payment gateway. Check this post it may be something useful since it's free you can give it a try and see. https://xenforo.com/community/threads/bitcoin-xenforo.157683/#post-1680507
