A payment facilitator is an entity, which, in contrast to an ISO (independent sales organization), takes active part in all the stages of sub-merchant life-cycle. An example of an ISO is a payment software company, which performs the respective functions for its clients. If an ISO wants to become a payment facilitator, it needs a clear transition strategy. One of the most important aspects is that a payment facilitator has to go through a separate underwriting procedure with the current or a new payment processor. Only after that it can address the questions, related to merchant underwriting, on-boarding, and funding (these are the first-priority issues that need to be taken care of by a payment facilitator).
A detailed description of step-by-step strategy for becoming a payment facilitator is given in the respective article on Paylosophy.