Webservice: check the open receivables of a customer
We have a customer which handles his product orders with a webshop.
If a customer which already exists (customer account) wants to order something in the webshop, they would have the possibility to check his open receivables before he can order something new.
My Question: Which is the best Webservice to check the account balance / the open receivables of a customer?
How can we handle this?
Our customer wants to see about his existing customer:
Customer X --> account balance of open receivables: 4'000 Euro
Thanks for helping