"Order API
Using this secure API, authorized apps and services can get or modify information about orders in your store.
"This API should be used for integrations with accounting applications(such as Quickbooks), CRM systems and affiliate systems; syncing orders with your other stores; creating custom reports, invoices and shipping labels, etc."
Anonymous
"Order API
Using this secure API, authorized apps and services can get or modify information about orders in your store.
"This API should be used for integrations with accounting applications(such as Quickbooks), CRM systems and affiliate systems; syncing orders with your other stores; creating custom reports, invoices and shipping labels, etc."
Source: http://kb.ecwid.com/w/page/25232810/API