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The Partner API uses the OAuth2 client_credentials grant. You get a client_id and client_secret from the Developers section of your SaturnShift PSP portal, exchange them for an access token, and send that token on every API request.

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Get a token

Send your credentials to the token endpoint. You can pass them in the form body or as HTTP Basic auth. 
curl -X POST https://api.saturnshift.io/oauth/token \
  -H "Content-Type: application/x-www-form-urlencoded" \
  -d "grant_type=client_credentials" \
  -d "client_id=ss_client_live_xxx" \
  -d "client_secret=ss_secret_live_xxx"
Response: 
{
  "access_token": "eyJhbGciOi...",
  "token_type": "Bearer",
  "expires_in": 3600,
  "scope": "transactions:read merchants:read"
}

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Use the token

Send it as a bearer token on every request: 
curl https://api.saturnshift.io/v1/transactions \
  -H "Authorization: Bearer eyJhbGciOi..."

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Token lifetime and scopes

  • Tokens expire after 1 hour (expires_in: 3600). Cache the token and refresh on expiry or when you get a 401.
  • Scopes are transactions:read and merchants:read. Request a subset with the optional scope parameter; you can never exceed what your client was granted.

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Security

  • Send the client_secret in the body or via Basic auth. Never put it in the query string.
  • Store the secret server-side only.
  • Rotate the secret any time from the Developers page. The previous secret stops working immediately.