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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).