Ask HN: What payment options do I have for starting up?

I would like to start off a small online business based in Europe and I'm researching ways to allow electronic payments. Classical card processors seem to be out of my reach because they require existing shopping carts (which I don't have because... I'm not selling anything yet), seem to have large fees and a painful registration process.

I really like Google Wallet (formerly Checkout) and it seems I could use PayPal as well, but I'm afraid that customers will not like it.

What has been your experience with electronic payments?

Has anyone used Google Wallet as the only payment option for their website?