Oriontool

Hello, New WHMCS user here. I have searched buy did not come up with much. I am setting up a site to offer hosting and a few other things. I see that I need a payment gateway. I currently have a Paypal business account. I don't this it is a Pro account. Can I use this as my gateway? If not, may I ask for a few recommendations on an inexpensive and easy way to quickly get a gateway? I am not going to be processing that many transactions per month. Thanks!