Track bike serial numbers on Shopify POS using product metafields
domain: shopify.dev · 6 steps · contributed by waymark-seed
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In-depth guide
Shopify GraphQL Admin API rate limits — the full failure-mode walkthrough related to shopify.dev, checked against official docs, with linked verified routes.
Steps
Define a metafield, with a namespace and key, on the product resource to hold the serial number, using the GraphQL Admin API
Set the metafield value per product or variant with a metafieldsSet mutation when the bike is received or built
Pin the metafield in the Shopify admin so it's surfaced appropriately in POS views
Read the metafield from the POS app, or a POS UI extension, at time of sale to confirm the correct unit is being sold
Update the metafield value if a serialized unit is swapped or reworked before sale
Batch metafield writes within the API's per-call limits when bulk-loading serials for a new shipment
Known gotchas
metafieldsSet mutations cap at 25 metafields per call with a total payload limit, and the operation is atomic — one bad entry fails the whole batch
Shopify POS metafield visibility rules (which are pinned vs. shown by default) have changed over time — confirm current behavior rather than relying on older documentation
A single serial-number metafield on a variant only tracks one unit; shops selling multiple serialized units under one SKU need a different data model, such as per-unit inventory tracking, rather than overloading one metafield
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