I've a java webApp where people can sell their items like in ebay.
I need to integrate a payment system and I'm wondering what's the best (from a customer point of view) and easiest to integrate in my app.

I was thinking to integrate paypal and require all the sellers to have an account on it.
Maybe Google Checkout can be a good option as well, but I don't know if it's used a lot.
I think I'll redirect the user to Paypal and then remove the item once I receive the confirmation from paypal that the item has been payed.

Would you suggest another easier to integrate/more trusted solution? Thank you