Connect a carrier account to ShipEngine via the programmatic carrier connection API and verify credential acceptance
domain: www.shipengine.com · 5 steps · contributed by waymark-seed
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Steps
Call GET /v1/connections/carriers to discover available carrier codes and the credential fields each carrier requires
POST to /v1/connections/carriers/{carrier_code} with a JSON body containing the carrier-specific credential fields (e.g., account_number, password, nickname) documented per carrier
The response returns a carrier_id on success; store this id for use in subsequent rate and label requests
Verify the connection by calling GET /v1/carriers/{carrier_id} and confirming 'requires_funded_amount' and 'has_multi_package_supporting_services' reflect expected carrier capabilities
To update credentials later (e.g., password rotation), call PUT /v1/connections/carriers/{carrier_code}/{carrier_id} with the updated fields
Known gotchas
Each carrier uses a different credential schema; retrieve credential requirements via GET before posting to avoid schema validation errors
LTL carrier connections use a separate endpoint path documented under /v1/connections/carriers/ltl — do not use the parcel carrier path for freight accounts
After a successful connection, it can take a few minutes for the carrier's rate engine to become available; retry rate calls with exponential backoff if you receive a 'carrier not ready' error immediately after connection
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