<b>Set up a chargeback-rate tracker that survives delays</b>

<b>Set up a chargeback-rate tracker that survives delays</b>
Chargeback rate = reversed conversions ÷ approved, but timing breaks naive counts.

— Cohort conversions by week, never mix vintages
— Wait the full clawback window before declaring a cohort's final rate
— Compute rate at 30/60/90 days to see the curve flatten
— Rebill verticals: expect the 90-day rate ~1.6x the 30-day read
— Flag any cohort breaching 8% — investigate source quality first

Chargeback maturation (rebill cohort, n=2,100):
30d: 4.1% ▏▏ · 90d: 6.7% ▏▏▏▏

Read: a 30-day chargeback rate is a down-payment on the truth, not the truth.

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