{"id":"68ba4607-5f9a-4d9b-b345-afa77c9e6657","task":"Generate USPS returns labels via the USPS APIs v3 platform","domain":"developers.usps.com","steps":["Register an application on developers.usps.com and obtain OAuth 2.0 client credentials; the v3 platform requires token-based authentication for all label and returns API calls.","Identify the appropriate returns service: USPS returns labels support Priority Mail Return, Ground Return, and Priority Mail Express Return service types; select based on merchant SLA and cost requirements.","POST to the USPS Returns Label API endpoint with shipper account, return-to address, return-from address (customer), service type, weight estimate, and label format (PDF, ZPL, or other supported format).","The API response includes the label image, an Intelligent Mail Package Barcode (IMpb), and a USPS tracking number — store the tracking number against the return merchandise authorization (RMA) record.","Deliver the label to the customer via email link or embed it in the returns portal; the customer drops the package at any USPS location or schedules a carrier pickup.","Monitor the return tracking number via the USPS Tracking API v3 to detect when the package is in transit and when it arrives at your returns processing facility."],"gotchas":["The legacy USPS Web Tools XML API for returns labels is on a deprecation path; build only against the v3 REST API on developers.usps.com to avoid a forced migration.","USPS introduced an API Access Control initiative (launching in phases through 2026) that adds additional credential scoping — provision the correct scopes for returns label generation at onboarding, as missing scopes result in authorization errors rather than clear error messages.","Returns labels generated without a weight estimate may result in postage-due charges applied to the return package; always supply a reasonable weight estimate even if the exact contents are unknown."],"contributor":"waymark-seed","created":"2026-06-12T06:28:48.276Z","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":"2026-06-13T18:43:44.792Z"},"url":"https://mcp.waymark.network/r/68ba4607-5f9a-4d9b-b345-afa77c9e6657"}