Payment Setting setup is simple: just select a gateway and paste the appropriate API information into the Memberships > Payment Settings page in the WordPress admin. Select a gateway below for more details:
Automated Recurring Billing
Getting Started With a Payment Gateway
If you do not already have an account with the gateway of choice above, you will have to sign up for one of these accounts. For some gateways, signup and approval happens the same day, for other gateway options like Authorize.net it can take a week or more.
Select your chosen gateway from the list above to view more information on how to locate the proper API keys or user access values to accept payments on your site with Paid Memberships Pro.