A limited company client has a bespoke invoicing system for their sales. They are switching to Xero for accounting after a management buyout but will retain the invoicing system.
With regards to MTD and a digital link, I have told them that downloading a .csv from the system and uploading it to Xero, doesn’t constitute a digital link. As a result, they are building an API (they are a software company after all) to link their invoicing system to Xero from where they will submit their VAT returns.
My question is - is a self-built API sufficient as a digital link or is there some approval/documentation processes to go through?