generated: '2026-07-11' method: derived source: openapi/ncr-voyix-platform-openapi.yml summary: types: - apiKey api_key_in: - header schemes: - name: hmacAccessKey type: apiKey in: header parameter: Authorization description: HMAC authentication. The Authorization header carries "AccessKey {sharedKey}:{signature}", where the signature is a Base64 SHA-512 HMAC computed over the HTTP method, path and query, Content-Type, nep-correlation-id, and nep-organization, keyed by the secret key concatenated with the ISO-8601 request date. See the ncr-bsp-hmac repository for reference implementations. sources: - openapi/ncr-voyix-platform-openapi.yml