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Event: checkout.session.initialized.v2 Fires the moment the buyer starts the checkout. At this point the form hasn’t been filled in yet, so customer and shipping come empty, paymentMethod is null, status is waiting_payment, and the commission amounts are zero — the commission doesn’t exist yet. There is also no amounts breakdown: tax is only calculated at payment time.

Payload

products lists the cart items at the moment the checkout started, and trackingParameters carries the parameters captured from the checkout URL — see Tracking parameters.