I've used it a bunch over the past 5+ years. Payer does not have to register. The money is just deposited into their accounts, though it could take upto a week

I've used it a bunch over the past 5+ years. Payer does not have to register. The money is just deposited into their accounts, though it could take upto a week especially if you pay using your bank acct and not credit card. There should be a list of banks they accept. It's pretty comprehensive I think.