Hello, I think i can explain what kind of use cases of above question, as I need answer too!!
for example, customer don't want to pay yet, but when their purchased goods arrived 7-11, they pick-up there and pay there.
to be able to do this, my ecwid-site needs post this customer's purchase info (basically all shopping car contents) into 7-11 system, meanwhile disable further process of my ecwid-site. this means this order will not be generated in my ecwid-site, but in my registered's 7-11 site, and I shall get a shipping number via 7-11 site which links to this purchase, then customer will be able to pick up and pay when I shipped his/her purchase items to 7-11 store.
I think the right Question would be:
(1) Is it possible to get ecwid-site shopping car item eg by using
https://app.ecwid.com/api/v1/STOREID..._auth_key=xxxx
(2) Can you make simple example php code if above is possible to do via a post html?