Ratchet and Clank on the ps2 did this insanely good. Some guy on youtube completely described how they did it, let me find that real quick.

Edit, this is the one: https://m.youtube.com/watch?v=6CnfnhTBWX0

This is the answer.

I would like to add that you can have multiple personal roboports in your armor to increase the bot limit.

You seem to know a lot of this, in order for your point to click for me, could you explain why some extra payment processor is needed? Would a simple bank transfer not work? If you give me your IBAN, we could let our banks take care of it, right?