anchor.diff:  
   List the authentication fields required by a specific Loyalty Program.
   <br> If a LP is not found, return a 404.
  -GET /lps/{lpID}/authentication-requirements
  +GET /lps/{lpID}/mv-md
   > Authorization: MAC id="...", ts="...", nonce="...", mac="..."
   > Accepted-Lang: us-en
   < 200
  
positive.code:             "description": "Field description"
              "links": {
                  "self": {
                      "href": "https://na.platform.points.com/lps/{lpID}/authentication-requirements/9876"
                      }
                  }
          },
  
negative.code:             "validation": "^[A-Za-z0-9]{8,16}$"
              "links": {
                  "self": {
                      "href": "https://na.platform.points.com/lps/{lpID}/mv-md/9876"
                      }
                  }
          }
          ]
      "links": {
          "self": {
              "href": "https://na.platform.points.com/lps/{lpID}/mv-md"
          }
          "member-validations":
          {
              "href": "https://na.platform.points.com/lps/{lpID}/mv"
          }
      }
  }
  