I need a developer who has done this before and understands how to protect software from being shared with other users. Please PM examples, suggestions and your experience to be considered for this project.
We have a billing software ([url removed, login to view]) we want our software to authenticate against everytime our software is run.
In our billing software we can designate different user types and levels, we need an encoded secure api for our software to check against.
Our software will need to pass a Username and Password to our billing software for authentication everytime it's ran.
The api should return (in XML?) the users subscription level.
If you have a better suggestion that's fine, but it has to integrate into our current billing software ([url removed, login to view]).
I need full sourcecode, documentation and installation instructions.