anchor.diff:  > Authorization: MAC id="...", ts="...", nonce="...", mac="..."
   > Content-Type: application/json
   {
  -    "mv": "/lps/12345/member-validations/78348927"
       "currency": "CAD"
       "amount": 220.34
       "billingInfo": {
  
positive.code:         "self": {
              "href": "https://na.platform.points.com/lps/{lpID}/mv/948202349"
          }
      }
  }
  
  
negative.code: > Authorization: MAC id="...", ts="...", nonce="...", mac="..."
  > Content-Type: application/json
  {
      "currency": "sky"
      "amount": 220
  }
  