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Receive the letter first, and then you can pay them. Atleast that's what I would do.
Sure, it's always preferable to reduce agreements to writing.
But, in my opinion, that does not translate into playing hardball unless or until they do so.
PFD or agreements not to report are a form of GW on their part. You take the chance by holding out that they will simply report.
PFD is not at option at this point, as there is no reporting to request deletion of.
DV, if timely, would produce a temporary block of credit reporting, but simple verification on there part could be followed by an immediate reporting. And by sending a timely DV, the cease collection bar it imposes on them would shut off ALL negotiations until they provide debt verification. If the debt is legit, and keeping it off your CR is the major goal, I dont see the benefit of a DV at this time.
If they are going as far as sending you a letter stating they wont report, that is more than a trust issue. It is a written offer.
Any counter-offer you send might take their offer off the table.
I would jump on it.
In my experience and in fighting collections, the CA's I've worked with do give you that initial 30 days to pay before they report. I think you will be okay. Just ask repeatedly that they are SURE they set their system to be sure not to report it.