Bought a L3+ today, questions about the wire transfer

Hello, today after much waiting and planning i managed to "reserve" a l3+, since i dont have any coins mined up and im new at this AND i was at work the only option for me was to chose the wire transfer payment method and try and sort it out when im off work.

I have never done a wire transfer or a bank transfer for that matter so my questions might come off as stupid or strange, but please bear with me and try and help if you can.

For the wire transfer to give my account credit for the purchase i assume the most valuable piece of info is the order id number? when i sign the papers is there a special category i need to fill it in?(on the order page it says in the bank deposit message). Would the completion of the sending papers with the bank info they provided and the order id number be enough, or would they be the main things i need done? im aksing because:

On the order page i get this messange as the last line:Please click the PDF button on right top corner of page if you want the proforma invoice to make the USD wire.
There is no button or link for me to click to acces the proforma invoice, i looked for it, couldnt find it, not sure if its the work computer blocking a popup or something. Is the proforma invoice necesary for the bank transfer process, or is it to facilitate a specific type of transfer in case i request it? and if its necesary why cant i acces it, and where can i get it from.

And second, on the orders page where my order gets confirmed and shipped, i have a transfer proof button, ive read that its there to facilitate faster transfer recognition, is it mandatory for the transfer? the account name its requesting, which account is it referring to, birmain one? bank account name? the amount in usd, should it include eventual bank charges? or just the price for the components bought?and why would i need to input the sum if i can upload a screenshot with the paper that i get from the bank to prove the transfer?

tldr , is the proforma invoice and the transfer proof necesary for the wire transfer?

I would sincerely appreciate help and clarification of any kind on this matter, as i live in a low income country, and im taking a loan and a big risk to get this mining device.