The issue here is that Express Checkout isn't available in all countries. When I was integrating PayPal for the startup I was working at last year we had to use

The issue here is that Express Checkout isn't available in all countries. When I was integrating PayPal for the startup I was working at last year we had to use Adaptive Payments because of this. I don't mean some small South American county nobody has heard of, the business was based in Ireland. As other commenters pointed out we didn't have much choice of providers because of our business model (hotel booking). Stripe and Braintree didn't want anything to do with us, so we went with PayPal to start with. I think they are now using RBS WorldPay, but even that had it's issues...