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Discount Drift Detection

Overview​

Discount drift detection monitors discrepancies between expected and actual discount amounts throughout checkout.

Detection Points​

  1. Payment Intent Creation: Compares engine total vs payment intent amount
  2. Webhook Processing: Compares snapshot total vs webhook payment amount
  3. Order Creation: Validates rule hash and engine version

Drift Severity​

  • CRITICAL: Blocks checkout (payment amount mismatch)
  • WARNING: Logs drift but allows operation (rule changes)

Drift Report​

GET /admin/discounts/drift-report?severity=CRITICAL

Returns drift events with filtering by date, severity, and discount ID.