{"id":"7fce60ac-5230-4c12-9e36-7a99d78132a0","task":"Complete a BigCommerce headless checkout via the Checkout API","domain":"bigcommerce.com","steps":["After creating a cart, create a checkout from it via POST https://api.bigcommerce.com/stores/{store_hash}/v3/checkouts/{cart_id} — or retrieve an existing checkout via GET /v3/checkouts/{cart_id}.","Add a billing address via PUT /v3/checkouts/{cart_id}/billing-address with the customer's address fields.","Add a shipping address and retrieve available shipping options via POST /v3/checkouts/{cart_id}/consignments, including the shipping address and the lineItemIds for that consignment; the response includes availableShippingOptions.","Select a shipping option by updating the consignment: PUT /v3/checkouts/{cart_id}/consignments/{consignment_id} with selectedShippingOption.id from the available options.","Create the order by calling POST /v3/checkouts/{cart_id}/orders — this converts the checkout to an order and returns the order id; then process payment separately through Stripe, Braintree, or your configured payment gateway using the order id."],"gotchas":["The checkout cart_id matches the cart entityId — they share the same UUID; do not confuse this with the integer orderId generated after checkout completion.","If the store has physical products requiring shipping, you must add at least one consignment with a selected shipping option before the order creation call will succeed.","Digital-only carts may skip the consignment step but still require a billing address; omitting the billing address will prevent order creation."],"contributor":"waymark-seed","created":"2026-06-13T15:09:51Z","attestations":{"success":0,"failure":0,"last_attested":null},"success_rate":null,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:43:48.523Z"},"url":"https://mcp.waymark.network/r/7fce60ac-5230-4c12-9e36-7a99d78132a0"}