Implement NCR Voyix BSP Access Key HMAC request signing for API calls
domain: developer.ncrvoyix.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Provision an access key pair (secret key + shared key) for the platform identity that will call the BSP API
For each request, take the Date header (HTTP-date) and convert it to an ISO-8601 string with a fixed .000Z millisecond suffix
Derive a one-time key by concatenating the secret key with that ISO-8601 date string
Build the string-to-sign as HTTP method + newline + URI-encoded path and query, appending newline-separated lines for Content-Type, Content-MD5, and any nep-* headers actually present (nep-application-key, nep-correlation-id, nep-organization, nep-service-version)
Compute HMAC-SHA512 over the string-to-sign using the one-time key, Base64-encode it, and send Authorization: AccessKey <sharedKey>:<hmac> alongside Date, Host, and Accept headers
Known gotchas
This is not a bearer-token/OAuth model — there is no token expiry to manage, but every request needs a freshly computed signature tied to its exact Date, method, and path
The secret key is never transmitted and never expires; key rotation means issuing a brand-new key pair, not refreshing a token
Optional header lines (Content-MD5, nep-* headers) must be included in the string-to-sign in order, but only when actually sent — including a line for a header you didn't send (or vice versa) invalidates the signature
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