curl --request POST \
  --url https://api.virtuoussoftware.com/api/Contact/Transaction \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "referenceSource": "<string>",
  "referenceId": "<string>",
  "contactType": "<string>",
  "name": "<string>",
  "title": "<string>",
  "firstName": "<string>",
  "middleName": "<string>",
  "lastName": "<string>",
  "suffix": "<string>",
  "emailType": "<string>",
  "email": "<string>",
  "phoneType": "<string>",
  "phone": "<string>",
  "address1": "<string>",
  "address2": "<string>",
  "city": "<string>",
  "state": "<string>",
  "postal": "<string>",
  "country": "<string>",
  "eventId": "<integer>",
  "eventName": "<string>",
  "invited": "<boolean>",
  "rsvp": "<boolean>",
  "rsvpResponse": "<boolean>",
  "attended": "<boolean>",
  "tags": "<string>",
  "originSegmentCode": "<string>",
  "emailLists": [
    "<string>",
    "<string>"
  ],
  "customFields": "<object>",
  "volunteerAttendances": [
    {
      "volunteerOpportunityId": "<integer>",
      "volunteerOpportunityName": "<string>",
      "date": "<string>",
      "hours": "<string>"
    },
    {
      "volunteerOpportunityId": "<integer>",
      "volunteerOpportunityName": "<string>",
      "date": "<string>",
      "hours": "<string>"
    }
  ]
}
'