Use Postman pre-request script for custom authentication

postman-custom-auth.md

Custom auth via Postman's Pre-request Script.

Usage:

• add request header, for instance X-Api-Token with value {{secret}}

• provide a pre-request script which builds the secret token and stores it to the global or environment variable named secret

  var privateKey = postman.getEnvironmentVariable("privateKey");
  var body = request.method === 'GET' ? '' : request.data;
  var hash = CryptoJS.HmacSHA256(body, privateKey);
  var hashInHex = CryptoJS.enc.Hex.stringify(hash);
  postman.setEnvironmentVariable("secret", hashInHex);