In what is potentially a big win for Software-as-a-Service accounting startup KashFlow, Barclaycard is inviting its business customers to join an e-invoicing pilot powered by the London-based company's wares.

According to an email that has been circulated by Barclaycard that we've seen, the credit card company, which is owned by UK bank Barclays, is inviting merchants to apply on a first come first served basis with the pilot scheme being limited to 100 places.

This would seem to indicate that Barclaycard is taking a somewhat cautious approach, although we understand it to be the first time that a major bank has backed an SaaS accounting package from a UK tech start-up.

We've reached out to KashFlow who have confirmed the existence of the pilot but declined to give further detailsHowever, here's what else we do know.