{
  "event": "recipient_sent",
  "recipient_id": "255e591c2c9fe1bc99be1ec03075b402",
  "envelope_id": "7e8f68e4c6df9395cd7ff48d69d7e2c1",
  "sent": "2019-12-17T05:30:00Z",
  "method": "email"
}
Triggered when a recipient has been sent a copy of the envelope to complete. This event is only triggered for non-muted recipients. If you are using muted delivery, you must manage recipient dispatch and eligibility yourself — typically by listening to envelope_sent and recipient_completed events. The payload includes a method property to indicate how the envelope was sent, such as "email" or "sms". If the recipient was sent both, two separate events will be generated. 
{
  "event": "recipient_sent",
  "recipient_id": "255e591c2c9fe1bc99be1ec03075b402",
  "envelope_id": "7e8f68e4c6df9395cd7ff48d69d7e2c1",
  "sent": "2019-12-17T05:30:00Z",
  "method": "email"
}