[jwt]

PayPal is by far the most cost-effective way (in terms of % rates) to get up and running - compared to the time and costs involved in setting up a merchant account/payment processor.

As Aaroneous mentioned- Paypal Website Payments Pro allows you to process paypal payments and credit card charges invisibly in the background (there is no redirect to Paypal).

The processing fees/cost economics of establishing a merchant account/processor definitely make sense however once you're processing several $k/month.