Sure do they talk to major app and web developers, to online stores and so on.Well, that doesn’t really mean anything. It’s not a bank. They „just“ make their app ApplePay ready.
I can’t imagine Apple tells all its German developers, hey, get your app ready, the launch is on X. Easyjet is smart and gets his app ready for whenever the official start is
Would be a damn dumb idea to launch such a service with „pay online too“ without any apps and webshops supporting it.