We are looking to launch a service where for given java phone application
a) User is charge for initial download
b) User can purchase new information, unlock levels etc - From WITHIN the application (ie opens up an HTTP connection from within the midlet etc)
From a development point of view we have this done, however finding a payment provider who can support this is proving difficult.
Getting the initial download charge is straightforward, the second bit is the stumbling block. I've talked to one company who will be providing an XML interface in the future. Does anyone know if there is one available now?