The online discount is Manchester and Liverpool only. Merry Hill runs on its own system, so the discount is set up with the Crew. Book a tour, and the Crew help you verify with GoCertify on your phone while you are there.
You check you qualify online, after your details, with GoCertify. It takes about a minute, and you choose what to verify as inside the check. We never see your ID.
Merry Hill memberships complete on Resamania. Manchester and Liverpool complete on Glofox, by Direct Debit. Your bank details are never taken on this site.