I guess we’re talking about making outbound Faster Payments? You can already receive an inbound Faster Payment the details on the Top-Up screen in your app.
We’d like to add Faster Payments and Direct Debit functionality to your account - probably some time in the first half of 2016. Each Mondo card will come with a unique account number and sort-code.
As for API access, that’s a slightly trickier question. In particular, we’ll need to look at adding multi-step confirmation or relatively strict limits to outbound payments. The danger is that a developer goes rogue and empties people’s accounts instantly. For example, we might ask for in-app confirmation - “Your accountant wants to move £3,000. Do you agree?”