How to change state of Send in Bulk using REST API V6

Once the Send in Bulk transaction is sent out for signature, how to change the state using REST API V6?

Environment

REST API V6

Steps

To change the state of Send in Bulk agreement, use put /megaSigns/{megaSignId}/state and do the following steps:

1. Go to REST API Documentation for V6 and select method  
   put /megaSigns/{megaSignId}/state.
2. Provide the Authorization value and also the If-Match and megasignID.
   • To retrieve megasignID, use get /megaSigns
   • To retrieve If-Match, use get /megaSigns/{megaSignId} and under header, locate "Etag"
3. {
     "state": "CANCELED",
     "megaSignCancellationInfo": {
      "comment": "cancel",
      "notifyOthers": false
     }
   } 

Additional information

Reference: https://secure.na1.echosign.com/public/docs/restapi/v6#!/megaSigns/getMegaSigns