Mechanically a chargeback is the same transaction as ship & debit; the term is standard in pharmaceutical and medical-device distribution, where contract prices are negotiated with a group purchasing organisation and delivered through a wholesaler.
The distinguishing feature is that validity turns on **eligibility as of the sale date**: was this provider a member entitled to this contract tier on that day. Because membership is effective-dated and provider identity spans several unrelated identifier systems, this is the check most commonly skipped.
Where chargebacks feed government price reporting, a validation weakness is a compliance exposure as well as a margin one — which is why the audit trail behind each acceptance decision matters as much as the arithmetic.