As far as I know the return of this API call in my screenshot has changed recently, breaking my NFT based game... it used to return the quantity, now it returns quantity of every user, ignoring the match_owner parameter...
tested here:
please help,
I was in the process of submitting the game for whitelisting, and had to postpone the demo because of this...
EDIT:
PS: It was working for around 6 months, something recent has changed and bugged it.