when adding a new card, there's no visual feedback to decide if the process is successful or not

[Julia Palandri]

When adding a new card in the wallet, after hitting the "add" button, it takes a while to complete the operation but there's almost no visual cue of what's happening and if I should hit the button again or just wait for it to complete.
I'm attaching a before and after picture for the button, and the change is really subtle. I can still hit it again while it's performing whatever it's doing.
I think it should be better that the button greys out or something like that.