SOFORT(.com) has built a strong market presence in Germany and is expanding throughout Europe. They basically do the same thing you are talking about: provide an easy "check-out" experience using customers' banking credentials and custom crawlers. The solution is well-liked by merchants. Banks generally don't like it (for obvious security/privacy reasons), but are cautious in actually preventing it. SOFORT actually u…
SOFORTÜBERWEISUNG looked sketchy as hell the first time I tried it. Imagine IMMEDIATEWIRETRANSFER.COM (in capital letters) asking you to enter not only your bank account number, but also your password, and then a PIN from your secret list. The latter is something that the bank tells you to never, under no circumstances, give out, because you can use it to transfer money. I find it really hard to believe that SOFORT d…
Personally, I avoid that service but it has the blessing of government agencies from operating that way.
Some banks (e.g. DKB) now started to cooperate with Sofort instead and the German banks will start a similar service themselves this year.