Google news in recent months has turned up a story about a company in France called Paymium that has been licensed as a bank (without going into just what the company does), and another company that has moved to Atlanta, called Bitpay, which enables customers who have web sites to accept bitcoin payments. The headlines about the latter seemed to be about the fact that they'd raised something over a half-million dollars from a small number of investors. Google news didn't include anything about Coinbase, as far as I recall. But a glance at websites makes it look as if they might all be in approximately the same business.
Can someone compare and contrast these companies, including, but not limited to, differences and similarities in what they do? And are there other such companies that are notable and that I've missed here?