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User API endpoints cover the merchant integration surface: creating return requests and shipments, managing return inventory and FBA instructions, requesting recalls, resends, and value-added services, generating labels, and querying account state. Most are tenant-scoped — your x-rr-apikey determines which warehouses, service types, and orders are visible. All requests must include x-rr-apikey and x-rr-apitoken headers. See the Authentication section for how to obtain your credentials. For state-changing requests, also include an x-returnhelper-idempotency-key header so retries don’t create duplicate operations — see the Idempotency section for details. Browse the endpoints from the navigation on the left.