We were collecting on the Saturday. The week before we toot the opportunity to send some test money (£1 and £2 from 2 different bank accounts) to our Tesla account. Initially we had no invoice so used the reservation code, but after getting a final invoice, we repeated using the invoice number - unless you have more than one purchase on same reservation, I don't think it makes any difference whether you use your reservation or invoice number.
We then looked in deposit paid field in source code to make sure test payments were received. Payments sent evening before seemed to show up around mid morning the following day.
Once happy, we then sent over the remainder over 3 days as we had time on our hands - I had a faster payment transaction limit on my account so kept things simple and worked within those limits.
Once correct amount had been received, we has an acknowledgement from Tesla. If you get a call where anyone mentions the outstanding amount, do double check that figure. We had triple checked the invoice amount (made slightly less obvious as it did not mention our trade in amount or the test payments) so had our own figure which did not tally by what Tesla rep told us. Our figure was right of course!
