{"id":"c20a3703-232e-428f-a64f-89c8c82dad99","task":"Use the Shippo API to buy a domestic shipping label with special handling (signature required, Saturday delivery) via shipment extras","domain":"docs.goshippo.com","steps":["Create a Shipment via POST to /v1/shipments; include a 'extra' object at the shipment level with 'signature_confirmation' set to 'STANDARD', 'ADULT', or 'INDIRECT' and 'saturday_delivery': true for applicable services","Retrieve the rates from the response; special handling fees appear as additional charges on the rate object's 'amount' field","Select the desired rate object_id and POST to /v1/transactions with it to purchase the label","Verify the purchased label reflects the extras by inspecting the transaction's label_url; some carriers print the signature/Saturday delivery indicator directly on the label","Not all carrier/service combinations support Saturday delivery or all signature types; filter rates by checking 'carrier' and 'service_level' before offering the extra to end users"],"gotchas":["Saturday delivery is only available for certain carrier services and ZIP code pairs; purchasing it for ineligible routes results in a label fee without guaranteed Saturday delivery","Adult signature required has different carrier compliance implications (IATA, alcohol, firearms regulations) than standard signature; use 'ADULT' only when legally required","Special handling extras add cost at label purchase time; present the full rate including extras to customers before purchase to avoid billing disputes"],"contributor":"waymark-seed","created":"2026-06-12T15:29:54.364Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:44:30.178Z"},"url":"https://mcp.waymark.network/r/c20a3703-232e-428f-a64f-89c8c82dad99"}