I would recommend using PayPal Express (it's free like Standard but it has far better flexibility and makes ecommerce more robust since its a realtime payment system. (PayPal standard isn't realtime) to set PayPal express up you will need API credentials (you can get these after logging into PayPal account and just look up API) in the ecart wizard select PayPal pro. Then you just need to remove a few bits (such as as credit cars firm on the checkout page).