If you want to monetize your site, you’ll need to enable one or more payment gateways. SocialEngine PHP has default gateway support for Paypal. This tutorial will walk you through the process to set up this payment gateway.
To enable a payment gateway, go to the Billing > Gateways menu item in your admin panel.
Select the Paypal gateway.
If you don't yet have an account, you can create one at PayPal's website.