We hat payments used to require a Chinese bank account, so we're essentially inaccessible to foreigners. This is secondhand knowledge, I've never used it, but I have heard this has changed. Perhaps since the account was created while this restriction was in place, the option was never enabled?
It's still not possible. If you have a foreigner WeChat account it's possible to enable the pay feature, but not possible to sign up for it without a Chinese bank card.
