{

"token": "XXYYZZ",
"team_id": "TXXXXXXXX",
"api_app_id": "AXXXXXXXXX",
"event": {
  "type": "grid_migration_finished",
  "enterprise_id": "EXXXXXXXX"
},
"type": "event_callback",
"event_id": "EvXXXXXXXX",
"event_time": 1234567890

}