In the GET of your order you need to have a:
"customer":{
"id":
Who needs to be mapped to your SEND.
if no customer id is given in your GET, you have to feed this back to your webshop builder. This should be facilitated in your API.
Who needs to be mapped to your SEND.
if no customer id is given in your GET, you have to feed this back to your webshop builder. This should be facilitated in your API.