Paypal offers me a pay-later option, apparently no matter how small the amount is or what I'm paying for. Sometimes two options (pay everything next month + pay in instalments). Or perhaps it's alwys two? I haven't really paid attention.

The next-month option is free (for me) anyway. I assumed that the risk of a one-month loan is low for Paypal and worthwhile because it takes a few transactions from the other payment processors usually offered by the same webshop. But that's just an assumption.