{
  "event": "recipient_viewed",
  "recipient_id": "255e591c2c9fe1bc99be1ec03075b402",
  "envelope_id": "7e8f68e4c6df9395cd7ff48d69d7e2c1",
  "viewed": "2019-12-17T05:30:00Z"
}
Triggered each time a recipient opens an envelope using a valid signing token. This event may occur multiple times for the same recipient — for example, if they reopen the envelope on different devices or sessions. Events may continue to be sent even after the envelope has been completed, provided the signing token remains valid. 
{
  "event": "recipient_viewed",
  "recipient_id": "255e591c2c9fe1bc99be1ec03075b402",
  "envelope_id": "7e8f68e4c6df9395cd7ff48d69d7e2c1",
  "viewed": "2019-12-17T05:30:00Z"
}