Rate-shop a return shipping label (estimate, no buy)
Live rate-shop for a prepaid return label using the entity’s configured Shippo carrier accounts. Returns the available rates[] WITHOUT purchasing a label (estimate only), so the caller can preview cost before deciding whether to deduct it from the refund. Ship-from is the customer address on the original order; ship-to is the default warehouse. An empty rates[] (no carrier account supports the lane) is a normal 200, not an error.
Authorization: compound read scope, requires BOTH returns:read AND fulfillment:read.
Authorizations
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.
Path Parameters
Query Parameters
Parcel length in inches (default 12).
Parcel width in inches (default 10).
Parcel height in inches (default 6).
Parcel weight in pounds (default 2).
Response
Available return-label rates (estimate)

