While Near Field Communication (NFC) is getting a lot of press lately with the announcement of the Isis partnerships, there are other technologies for mobile payment that don’t require either a specific terminal, nor complex agreements among the various parties.
An example is TagPay, a mobile payment solution developed by a French startup called Tagattitude. The product is based on the NSDT technology (Near Sound Data Transfer), which is simpler to implement than NFC-based systems. The can be used in a variety of applications, such as mobile point-of-sale payment, money transfer, web authentication, or control and authorization of physical access.
More information: Tagattitude