Primer, one of London’s hottest new payment startups, has today announced a £14m funding round led by top venture fund Accel. But the fintech will still need to win over larger payments providers to operate, says the chief executive of Checkout.com. AdvertisementBut Guillaume Pousaz, the CEO of Checkout.com, says Primer should not expect him to collaborate. In fact, Primer relies on these providers, continuing to route the same volumes to Checkout.com and the like, while charging merchants its own software fee on top. The startup could also boost competition by allowing merchants to pick and choose different payment providers — without integration penalties.