# Supported pre-order additions to an existing UK Square restaurant bill **URL:** \ **Category:** Questions\ **Created:** [October 22, 2026, 11:56am UTC](https://developer.squareup.com/forums/t/supported-pre-order-additions-to-an-existing-uk-square-restaurant-bill/28295 "2026-10-22T11:56:45Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![soubs](https://avatars.discourse-cdn.com/v4/letter/s/f6c823/32.png) [@soubs](https://developer.squareup.com/forums/u/soubs)\ **Post date:** [October 22, 2026, 11:56am UTC](https://developer.squareup.com/forums/t/supported-pre-order-additions-to-an-existing-uk-square-restaurant-bill/28295/1 "2026-10-22T11:56:45Z")
Hi Square team, Retriever manages bookings and food pre-orders for The Old Dog in the UK. We can already read the venue’s OPEN Square POS orders. Please confirm whether there is a supported way for our integration to add the saved pre-orders to an existing unpaid table bill. The intended workflow is: 1. Staff open a table bill normally on the till and select that bill in Retriever. 2. Retriever appends the booking’s Square catalogue items and modifiers once. 3. Staff continue adding food and drinks and take payment normally on the same bill. The public Update Orders documentation says UpdateOrder cannot update orders created in Square POS: > **[Update Orders](https://developer.squareup.com/docs/orders-api/manage-orders/update-orders)** > > Learn how to update orders and specify sparse objects in an update request to add, update, and delete fields. However, this October discussion reports a booking platform successfully adding catalogue items to staff-created Register tickets, with a Square employee acknowledging the workaround: > [@Joining the OPEN orders alpha: unpaid API orders as open tickets on Square Register](https://developer.squareup.com/forums/t/joining-the-open-orders-alpha-unpaid-api-orders-as-open-tickets-on-square-register/28086): > > Hi Square team, In this thread( [Is there an equivalent supported mechanism for Square Register and Square Handheld?](https://developer.squareup.com/forums/t/is-there-an-equivalent-supported-mechanism-for-square-register-and-square-handheld/27028) ), said OPEN order workflows are “still considered alpha (not yet beta).” In this one, [Create Open Order (Open Ticket) from API](https://developer.squareup.com/forums/t/create-open-order-open-ticket-from-api/27237), she said unpaid API orders “can surface on Square devices in some configurations.” We’d like to join that alpha, or learn how to request access. What we’re building: RoundOver is a booking system for activity venues (axe-throwing lanes, golf simulator … Please confirm: - Is adding items this way officially supported for a UK merchant such as The Old Dog, or is it experimental behaviour we should not rely on? - Which API or partner capability should we use, and what permissions, enrollment, POS mode, hardware and app versions are required? - Are added lines preserved when staff subsequently edit/save the bill, including its table association and any card tab? - How should printer/KDS routing and course timing work, and how should we prevent duplicate kitchen tickets? - Is the IN\_STORE closed beta relevant, or is another supported route available? We can provide application/location identifiers and confirm the venue’s device details through a private channel if needed. We have not tested writes against the venue’s live bills. We would like a supported route confirmed before arranging a controlled test with staff. Thanks, Peter Sowrey Retriever ---
**Author:** ![jaeha](https://avatars.discourse-cdn.com/v4/letter/j/ebca7d/32.png) [@jaeha](https://developer.squareup.com/forums/u/jaeha)\ **Post date:** [October 23, 2026, 5:39am UTC](https://developer.squareup.com/forums/t/supported-pre-order-additions-to-an-existing-uk-square-restaurant-bill/28295/3 "2026-10-23T05:39:35Z")
Welcome to the Developer Forum! There isn’t currently a documented, supported way to add items to a bill that staff opened on the POS. The [Update Orders limitation](https://developer.squareup.com/docs/orders-api/manage-orders/update-orders) still applies. The IN\_STORE fulfillment beta access doesn’t cover this either. It applies to orders your app creates, not bills opened on the POS, and on its own it doesn’t enable open (unpaid) order workflows. An alternative supported workflow is to create and fully pay a separate pre-order through your integration. Staff would bill additional purchases separately. However, this would not provide the single restaurant bill you’re asking for.