It is not possible to update a checkout object via Shopiy's Admin REST API unless the custom app created the checkout object.
Per Shopify Staff:
The checkout PUT endpoint is intended to only be used to modify checkouts that were created by that same app.
Reference:
- https://community.shopify.com/c/graphql-basics-and/update-checkout-not-working-on-api-2023-01-checkouts/m-p/2025238/highlight/true#M5766
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