Apple Cash
I find it odd things like this, Venmo, Square cash even need to exist. There’s a reason none of them get used much (or even exist) outside the US. Just fix banking in the US and they problems they solve disappear. In the UK (and the EU I believe too) bank transfers and instant and free. Digital banks like Monzo make it even easier (through contact syncing, better UI). Third party apps need not get involved.