Xero Accounts API Work

I am about to build a bespoke contract management system in Windows Forms. I need to send Purchase Orders to the clients Xero Accounts. I believe that this cannot be done in Windows Forms itself, but I hope to show the custom app in a web browser control within the windows forms application. The developed app must read a simple table from an SQL Azure table, create a purchase order in Xero and update each row to mark the unique PO reference created in Xero.