Offer and reserve a delivery time-slot for a customer using the Instacart Connect Fulfillment API
domain: instacart-connect-delivery-slots · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Call the preview service-options endpoint to show available delivery time slots before a cart is finalized
Once the cart is built, call the list cart service-options endpoint to get the live set of bookable slots for that cart
Reserve the customer's chosen slot with a service-option hold tied to the cart, or a desired-window hold at the preview stage
Convert the hold into a confirmed order before it expires
For last-mile-only flows, use the equivalent preview/list service-option endpoints under the last-mile path
Known gotchas
Holds expire after roughly 10 minutes if not converted into an order, so checkout flows must complete the reservation quickly
Access requires a signed Instacart Connect agreement plus assigned client credentials — it's not open self-serve
Cart-stage and pre-cart preview endpoints return different option shapes; mixing them up leads to booking a slot that's no longer valid for the finalized cart
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