Buy points allows you to simply buy user points without the need of a heavy Virtuemart solution. This little component is a single user interface to purchase points directly with Paypal

Stripe EasyPay for Joomla is an extension that allows you to add a credit card payment form on any page of your Joomla site using the Stripe payment service.

Payage is a Pro Joomla Component that manages online payments via multiple payment gateways for multiple Joomla components. It has a well-documented API so is an ideal payment platform for any Joomla component.

RO Payments supports a large number of Joomla! extensions and payment providers, combined with profiles, you can setup different payment providers on a single site. This makes for a very flexible setup and gives you a lot of control on how the payments flow on your site.

Seamless Payment Gateway for PayPal Plus. It is suggested to have an SSL Certificate on your website because the credit card payments are processed directly on your server.