Online by card (Visa or Mastercard), through NETOPIA Payments. You pay straight from the invoice page in your client account, and the payment is confirmed insta...
Clarify this requirement before placing your order or making payment. Ask your finance team for the exact reference and check whether it must appear on the invoice or whether linking it to the document in your internal records is sufficient.
Then send a request with your order number and the required reference, without including unnecessary confidential information. Ask whether it can be added and under what conditions. Do not assume that a reference entered in a comments field will automatically appear on the tax invoice. If the invoice has already been issued, ask what options are available rather than editing the document yourself.