Each card network sets its own monitoring thresholds, which change over time, and banks often apply a stricter limit of their own. Keeping the rate low is part of keeping your card account.
Dispute rate
Disputes as a share of card transactions in a period, watched closely by banks.
See it running on your own catalog
Purity does the work these terms describe: batches held until their lab report is in, payments matched to orders, and wording checked before it sends.