New Trading Partners Where a taxable person, already authorised to issue or receive messages by electronic means, wishes to take on a new electronic trading partner, he or she should write to their local VAT Office giving the name, address and registration number of the proposed new partner. That partner should, at the same time, formally apply in accordance with the authorisation condition for the appropriate authorisation. Required action for EDI tradefast user Users wishing to extend their use of electronic invoicing should first contact eircom net as the current functionality of EDI tradefast does not readily cater for this extended use. However eircom net have a wide range of products and services that can fulfil this requirement.