There was discussion last year on these boards about Macros and it sounds like something like this could be possible:
One huge hassle of the iTunes store is that it doesn't let you store multiple payment profiles, so you have to manually retype all the field information. To add to the pain, they don't link to secure storage extensions/apps like 1Password to ease the pain. Apple really doesn't want you having multiple credit cards attach to iTunes.
Anyway, it seems like you could theoretically create macros with the text blade to automatically form fill this for many different profiles quickly (you can't do this on iOS with software keyboards since apple doesn't allow 3rd party software keyboards have access to secure fields). Of course, it might be incredibly unsafe to store your CC this way, but I'm wondering if there is a process using text blade where this could be done safely.
For example, could you envision a system where you can use TouchID on the TextBlade app to unlock certain macros?
Is it possible to unlock the TextBlade with a password sequence of chords/key strokes?
If you could set up a macro with Pythonista or equivalent to pull information from the self-destructing clipboard - 1Password has this option and requires a TouchID event - and then send the password in the temporary clipboard to the text blade keyboard through the app. I'm just thinking out loud. It might be worth thinking about linking multiple apps together to make this happen seamlessly.