[Josh]

We also never increase pricing for existing customers as long as they remain active on their current plan. Changing plans would default to latest pricing, as would canceling and coming back.

In regards to moving your payment processor, the path of least resistance would be waiting until terms expire and clients are re-signing/signing new clients to the new payment processor. You certainly can transition active clients, but that tends to be a little messier and may lead to some turnover.