They stopped letting you add funds on the Vita so you have to do it on the web or another device. I don't think the PS4 store has Vita Games, the PS3 did but it

They stopped letting you add funds on the Vita so you have to do it on the web or another device. I don't think the PS4 store has Vita Games, the PS3 did but it actually supported transfering to and from the Vita whereas the PS4 never did. So you still need to make purchases on the Vita itself (or I guess a PS3). I had all my Vita games on my PS3 so I could transfer them rather than slowly redownload them on it itself but Sony BROKE that functionality when they forced two factor authentication. The worst bit is they couldn't even be bothered to offer a sensible error message like "this feature isn't supported anymore" you just get some cryptic error number. I loved the Vita but I'm never giving Sony money for a handheld again.