I think he/she/ze (idk really these gender pronouns are confusing me, there are 312 of them) meant stuff like background gift, pet gift etc. since those are on sale. (Background is being sold for 10 diamonds but background gift is 50% off rn) so probably tried to do something like that and it didn't work.
But if it's really the certificates, then i don't know.
I am handing out equal judgment to everyone at an affordable rate, call me Fix Price,
When the king dies, make sure his grave is King-Size.