After you setup the Poller, the response body of the events contains information which is based on specific fields. These fields are common across all the elements in the catalog. The fields which are found in the payloads are listed here:

{
"id": "AXJ416mPOfNnse23sGORakc",
"status": "NOTIFIED",
"timestamp": "Wed Jun 01 2020 00:00:00 am",
"accountId": 123456,
"element": "elementname",
"elementInstance": "123456",
"error": "",
"providerData": {
"eventType": "eventType",
"objectId": "12345",
"createdAt": "2020-01-01T00:00:00Z",
"firstName": "Test",
"lastName": "Test",
"lastmodifieddate": "12345667889044"
},
"objectType": "object",
"pollDate": 12345465654,
"eventElementInstances": [{
"eventId": "AXJ4234mPOfNnIsGORakc",
"elementInstanceId": 1234566,
"userId": 433214,
"accountId": 323555,
"notificationId": 123456744,
"notifiedData": {
"accountId": 21334,
"companyId": 25343,
"elementKey": "element",
"eventId": "AXJ416mPOfNnI32948dORakc",
"events": [{
"objectType": "object",
"objectId": "123456",
"date": "2020-01-01T00:00:00Z",
"pollDate": "2020-01-01T00:00:00Z",
"eventType": "eventType",
"elementKey": "element",
"hubKey": "key"
}],
"instanceId": 123145,
"instanceName": "test",
"instanceTags": [
"Test"
],
"instance_id": 12354,
"raw": {
"leads": [{
"eventType": "eventType",
"objectId": "1231244"
}],
"objectType": "objectType",
"pollDate": 12314358593983
},
"userId": 123456
},
"createdDate": "2020-01-01T00:00:00Z",
"updatedDate": "2020-01-01T00:00:00Z",
"objectIds": [{
"value": "1234567"
}]
}]
}