Visa Developer is a new initiative set up by the American multinational financial service provider to jump on the online payments bandwagon.
This service essentially opens up Visa's massive infrastructure to anyone who wants to use it. While Visa is a surprisingly late entrant into this market, Visa Developer should catch on very fast because of all the advantages that Visa has -- most people have access to a Visa card, and probably feel more secure dealing with Visa than a company like Google. Visa also promises security, history and customer service in ways that market startups do not.
Visa Developer is pitched to companies who might see the appeal in selling stuff by connecting their products to Visa's back-end infrastructure.