Answer
Take the IFS web landing page URL for your site and append /admin to it (e.g. https://<host>:<port>/admin), then navigate from there to Interface Browser and select BizApi to reach the same kind of EDI schema documentation. Standard EDI numeric document codes (like 810) aren't directly searchable by number in this interface — instead search using the underlying BizAPI's functional name (for example, 'send_invoice' for an 810), from which you can select the inbound/outbound XML schema, or view a sample XML for that specific message type.