Just purchased and sent them an email containing what they needed.
EDIT: Haven't received anything yet, possible that it's because it's late.
EDIT2: Been 18 hours now and have not received anything.
EDIT3: Has been 24 hours now, contacted support earlier in the day and they said "We do advise it can take up to 24 hours to deliver your private build!".
EDIT4: Finally got the cheat after I told support it had been 24 hours.