HI,
Do you want to become a payment service provider.? You haven't said what region of the world you are in. You will need to contact multiple acquiring banks (like Streamline or Worldpay) via the Transaction Network Services (in UK) ... have you or, will you be doing that? Once you are registered and accredited with an acquiring bank, that could generally support multiple banks, you'll then be able to accept customers and set up merchant accounts on behalf of the bank/s you're accredited against. This process repeats for different regions of the world and sometimes for different banks in the same region.
If you have the phenomenal amount of time, money and patience available, it is possible. We are always eager to innovate and fearlessly apply new technologies.
We have worked on modules of custom payment service provider software development and can harness required skills for the job. But this will take lots of time, skill-sets and effort.
Thanks and regards - Ajit