Currently, the cost a merchant pays for a Shopify Shipping label is visible in the order timeline in the Shopify admin UI, but it is not accessible via the Admin GraphQL API. The Order.transactions, Fulfillment, and FulfillmentOrder objects contain no label cost fields. The only workaround is shopifyPaymentsAccount.balanceTransactions, which requires Shopify Payments and is not scoped per order natively.
Requested: Add a labelCost or shippingLabelCost field to the Fulfillment or Order object in the Admin GraphQL API so merchants and apps can pull per-order label expense programmatically without a Shopify Payments dependency.