This module offers a testing option by PayPal Sandbox.

Don’t want to deter new members with a paywall, but want to give those good-hearted samaritans the opportunity to support your hard work?

Adding a customized donate button can generate enough extra cash to keep you motivated and pay the bills.

You can create a PayPal Donate Button directly from your back-end. Make sure your button is placed prominently throughout your site for it to be most effective.

PayPal does take a small percentage of payments processed through their service.