Have a look at this
old thread. As you'll see, about half way down info about a white paper shows up. And that's when I changed my mind about remote capture.
The Fed has had an opportunity to issue an interpretation or amendment to Reg. CC to clarify the issue. The fact that we have seen nothing suggests that they are waiting to see what "shakes out" in the industry.
I do recommend that your contract provide availability that is no less customer-favorable than what the customer would receive if you were dealing in paper checks, deposited conventionally. In that way, if the Fed ultimately opines that Reg CC applies, you won't need to change things.