thanks for your reply.
Since we are building an app that should work for all kind of shops the limitation to plus clients is not an option we can take.
I seemed to have confused the checkout API with a post to checkout url. Sorry for that.
So what we use is a post the following url:
And we pass arguments like:
We now adittionally want to force (in only SOME cases) the checkout to force the customer to have to enter the billing address manually.
We tried to use arguments like:
This works only if all other values from the first checkout page (which we can't all provide) are also provided.
So it seems that those initally passed arguments are not passed on to step2 of the checkout if step1 is not completly filled out.
So help to solve the requirement (in any way) would be really higly appreciated.