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If they accept a settlement for less, they have the option to additionally provide the special comment of settled/paid for less.
That informs others, in a manual review, that you have a history of not paying the entire debt that you obligated.
You can, as part of any settlement offer, include the additional condition that they agree not to report any reference to the debt having been settled for less.Your credit report will then look the same as if the debt had been paid in full (i.e., status: paid; balance: $0).