One picture, about ten seconds on a phone.
What to send: a screenshot of that charge in your card statement or banking app. It must show the name of the charge and the amount (the date helps too). The emailed receipt from our card processor, or the confirmation page you saw after paying, is not enough on its own — we need the charge as it appears on your card.
Please cover your card number, your balance and your other transactions — we only need that one line.
Why we ask: your statement shows our card processor's name rather than ours. A picture of that line, kept with your order, settles any question about the charge straight away — for you as much as for us.