That I`m not too sure of.... I printed off the order form and filled it in[specs etc] and just enclosed it with my contact details on it too..... I think you can pay on -line using the option there but you still need to make sure you pop your contact details into the envelope with your Template so they can `match`the payment to you ...I assume if you pay on line, you`ll get a receipt number...just make a note of it on the sheet along with your details. I had a look at the ordering methods there...... if you`re ordering on-line,you log in with your Toplace account details ....... no doubt you`ll get a receipt number etc... just pop a note of it in with your Template... I simply printed off the order form, put my specs. and contact details on and sent it off with the Template.... John sent an invoice once the Template arrived [so I knew it had arrived there !] so I just usually pay that way ... your choice really.....