Unfortunately Memberstack currently only supports Stripe payment platform. Multiple payment options is on our roadmap although we don’t have an exact ETA on when this will be ready yet. We are currently in the process of expanding our dev team from 1 to 2 with the hope to release new features faster and faster!
There is a forum thread here: Payment gateways where you can add your preferred payment method, we will look at this when we build this feature.
Hope you are keeping safe and well in these crazy times too😊