generated: '2026-08-28'
method: searched
source: https://marketplace.sears.com/docs/api-guide/using-sear-marketplace-apis-for-xml-integration/credentials-and-authentication/
docs: https://marketplace.sears.com/seller-support/api-authentication-process/
api: Sears Marketplace Seller API
base_url: https://seller.marketplace.sears.com/SellerPortal/api
note: >-
  Derived by hand from the provider's own published API Guide rather than from an OpenAPI
  securitySchemes block, because Sears Marketplace publishes no OpenAPI. The scheme is a custom
  HMAC signature, not OAuth, not OpenID Connect and not a bearer token, so there is no scopes/
  artifact for this provider.
schemes:
  - id: hmac-sha256-authorization
    type: http
    scheme: custom
    in: header
    name: Authorization
    algorithm: HMAC-SHA256
    label: HMAC-SHA256 request signing
    header_format: "HMAC-SHA256 emailaddress=<email address>,timestamp=<timestamp>,signature=<signature>"
    string_to_sign: "<sellerId>:<emailaddress>:<currentTimestamp>"
    timestamp_format: "yyyy-MM-dd'T'HH:mm:ss'Z' (UTC)"
    timestamp_validity: 30 minutes
    signature_encoding: hexadecimal
    secret: base64-encoded seller secret key, self-generated in Seller Portal under Account Info
    credential_scope: per seller account; secondary users must generate their own key
    documented: true
    source: https://marketplace.sears.com/docs/api-guide/using-sear-marketplace-apis-for-xml-integration/credentials-and-authentication/
oauth2: false
openid_connect: false
mutual_tls: false
api_keys: false
scopes_published: false
credential_acquisition:
  self_service: false
  requires_account: true
  steps:
    - Apply to sell on Sears Marketplace at https://marketplace.sears.com/sell-on-sears/
    - Log in to Seller Portal at https://seller.marketplace.sears.com
    - Open your name menu (upper right) -> Account Info and generate the base64 secret key
    - Compute the HMAC-SHA256 signature per request and send it in the Authorization header
deprecated_schemes:
  - id: email-password-in-url
    retired: '2016-03-31'
    note: >-
      Before 2016-03-31 API URLs carried an email address and password. Those calls are now
      rejected outright; the provider states this explicitly in the API Guide.
unauthenticated_behavior:
  probe: https://seller.marketplace.sears.com/SellerPortal/api/oms/purchaseorder/v19?sellerId=1234
  observed: '2026-08-28'
  http_status: 200
  content_type: application/xml;charset=UTF-8
  body: "<api-response><error-detail>Missing Authorization header in request</error-detail></api-response>"
  note: >-
    The API answers an unauthenticated call with HTTP 200 and an in-body error element rather than
    401/403. Clients cannot rely on the status line to detect an auth failure.