There are MANY consideration in addition to the technolgy: 1. You'll get killed with currency conversions with PayPal. They're the equivalent of thieves in thi

There are MANY consideration in addition to the technolgy: 1. You'll get killed with currency conversions with PayPal. They're the equivalent of thieves in this regard. If you're expecting lots of non-GBP income, this could become a significant cost of running the business. But they're very convenient and easy to link to UK bank accounts. 2. Don't get married to one provider. Use a "meta" API like Spreedly (http://spreedly.com/ http://spreedly.com/ ) so that you can quickly/easily switch if something goes wrong. With all the "PayPayl is evil" stories of late, this is simply prudent. I haven't used Spreedly yet, but heard good things about them, and they answered a quick question I recently asked them. 3. Google Checkout is not as well-known as PayPal. Funny anecdote I can't find the reference for now: A website was using PayPal and thought to add Checkout, with both icons next to each other on the page. Their Paypal earnings shot up significantly, and Checkout got very little additional revenue. 4. If you accept credit cards for payment, ne careful with PCI compliance, even if you don't accept credit cards on your own servers: http://en.wikipedia.org/wiki/Payment_Card_Industry_Data_Security_Standard http://en.wikipedia.org/wiki/Payment_Card_Industry_Data_Secu... . If you process the CC info yourself, PCI compliance can be very expensive for a sole hacker or small business, so consider off-loading the processing to a provider. You'll still need to have some level of compliance as I understand it, but it's easier. IANAL so get proper advice from your lawyer and accountant type friends. 5. Taxes and HMRC. 'nuff said.