tav, have you looked at Stripe's Connect product (https://stripe.com/connect)? Stripe already is a payments company, and Connect is built to let you use it somewhat like your own payments company, to pay others. Lyft uses it to pay its drivers for example, who also tend to be distributed and dynamic.
(Disclaimer: I work for Stripe, as of like last week. :)
(Disclaimer: I work for Stripe, as of like last week. :)