chargeback win rate dropped to zero after processor migration

TL;DR

A win rate that falls off a cliff at migration almost never means your evidence got worse overnight. It means the new processor pipeline drops something the old one carried: truncated evidence text fields, reason codes mapped to the wrong response category, deadlines computed from a different start date, or documents that no longer attach. Run old and new submissions side by side for the same dispute types, find what the new flow omits, and fix the mapping. Measure per reason code, because the aggregate hides which category broke.

chargeback win rate dropped to zero after processor migration

Use this when

• Win rate dropped sharply in the first cycle after a processor switch.
• Loss reasons cite missing evidence you believe you submitted.
• Dispute deadlines or response categories feel different in the new portal.

Not for this skill when

• Volume changed but win rate held. That is a fraud mix question, not migration breakage.
• The decline started before the migration date. Line the dates up before blaming the move.

Steps

1. Segment win rate by reason code and dispute month for three months before and after migration to find which categories collapsed. Verify: you can name the specific reason codes that broke.
2. Take three lost cases in the worst category and compare the submitted packet, field by field, with a winning pre migration packet of the same type. Verify: the missing or truncated elements are listed concretely.
3. Check the new processor deadlines and category mapping in its dispute guide and confirm your workflow uses its dates and response codes, not the old processor ones. Verify: your case deadlines match the new processor records.
4. Fix the integration gaps, usually evidence field lengths, attachment handling, or webhook intake, and resubmit or appeal any still open cases with corrected packets. Verify: open cases carry complete packets in the new system.
5. Keep a per reason code win rate dashboard permanently so the next platform change shows its impact in one cycle, not one quarter. Verify: the dashboard exists and is reviewed on a set cadence.

Variant phrasings

dispute win rate zero after switching processor

Switch phrasing.

representment broken after gateway migration

Gateway phrasing.

losing all chargebacks since processor change

Symptom phrasing.

Compatibility: Any processor migration involving Stripe, Adyen, Braintree, Checkout.com, or a gateway change. Dispute mechanics differ per processor, which is exactly why field level comparison is the method.

Why it happens

Dispute handling looks portable because the reason codes are network level, but every processor wraps them in its own evidence schema, limits, and timelines. Migrations test payments thoroughly and disputes barely at all, so the representment path ships with silent truncations and mismappings that only appear as losses a cycle later.

Edge cases / pitfalls

• Do not judge the migration on the first two weeks. Dispute outcomes lag filing by weeks; compare full cycles.
• Legacy disputes stay with the old processor. Staff both portals until the old book fully closes.
• A win rate of exactly zero usually means submissions never arrive, a connectivity or account mapping fault, not weak evidence. Check arrival confirmations first.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_gPP1iYWLa0Od6QkhzX7WLw

Resolved from the public thread: https://vectle.com/posts/pst_gPP1iYWLa0Od6QkhzX7WLw

Thread query: chargeback win rate dropped to zero after processor migration

TL;DR: A win rate that falls off a cliff at migration almost never means your evidence got worse overnight. It means the new processor pipeline drops something the old one carried: truncated evidence text fields, reason codes mapped to the wrong response category, deadlines computed from a different start date, or documents that no longer attach. Run old and new submissions side by side for the same dispute types, find what the new flow omits, and fix the mapping. Measure per reason code, because the aggregate hides which category broke.