If I have another friends account on my ps4, and I buy a game from the ps store from his account on my ps4.
Who will pay for it? Me or him?
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Your friend will pay.
The only way to buy stuff on the PSN is either through a credit card or prepaid funds. Both are registered to your account to allow you to use them on other PlayStation consoles you may own, such as PS3, PS4, PSP, or PS Vita.
Also keep in mind that you won't be able to use whatever "you" bought if your friend's account is removed from your PS4.