The "Payments" tab in the MemberPress options is where you can specify which payment gateways your users can pay with. MemberPress currently supports three of the biggest payment gateways. PayPal, Authorize.net, and Stripe. More payment gateways will be supported as time progresses.
If you are unsure which gateway(s) may be the best fit for you, then please reference our article on Choosing a Payment Gateway.
To add a gateway, simply click the + button at the bottom of the page. Each gateway has its own options that must be configured to connect it with your account. More detail about setting up each gateway is specified below.