The 201 response includes the session id, a ready-to-use checkoutUrls.webcheckoutUrl to redirect the buyer, calculated cart totals, and a checkoutStatus indicating whether the session is ready for checkout.

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No follow-up GET required

Everything needed to launch the buyer into checkout — including the session ID — is returned directly in this response. Use checkoutUrls.webcheckoutUrl to redirect the buyer, or pass the id to your frontend integration.