Support How to buy account upgrade for X account via link only?

[kutaz]

Hello,
I’m looking for a native option to buy account upgrades from X account for Y account, without using any plugins.

For example, here we can choose the provider and the upgrade ID. My question is: is it also possible to specify a user ID in order to buy this upgrade for another user?

https://example.com/purchase/user_upgrade/?user_upgrade_id=1&payment_profile_id=1