systeme.io sends a webhook for each sale, cancellation and opt-in. BrainyMetrics turns each sold item (main offer, bumps and upsells) into its own sale, with the price-plan amount minus any coupon discount, and marks cancelled sales as refunded. Opt-ins become leads.
Signatures are verified against the raw body. Add a hidden tracko_vid contact field for an exact browser match; otherwise buyers are matched by email.