fulfillment:writeDelegates to the canonical fulfillPackage handler. Posts COGS, revenue, tax, shipping, and discount GL entries (FIX REQUIRED #14/15/16/24 inherited transparently). Triggers marketplace tracking push and shipment email. Idempotent via Idempotency-Key.
Documentation Index
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API key issued per entity via Settings > Developers > API Keys.
Each key carries scopes (e.g. orders:read, products:write).
Bearer token format: Authorization: Bearer ark_live_ent_Test keys use ark_test_ent_. Both are issued per entity
via Settings > Developers > API Keys.
Fulfilled package with GL confirmation
A shipment / box created during fulfillment. One package contains many package items (line item splits) and at most one shipment label.
package Sequential per entity.
packing, packed, labeled, shipped, delivered, returned, void e.g. ups, usps, fedex, dhl.
e.g. ground, priority, 2day.
Cost billed to customer (vs purchased cost).