curl --request GET \
  --url https://api.virtuoussoftware.com/api/VolunteerOpportunity/{volunteerOpportunityId}/Volunteers/{volunteerId} \
  --header 'Authorization: Bearer <token>'

{
  "id": "<integer>",
  "volunteerUrl": "<string>",
  "createDateTimeUtc": "<dateTime>",
  "createdByUser": "<string>",
  "modifiedDateTimeUtc": "<dateTime>",
  "modifiedByUser": "<string>",
  "contactId": "<integer>",
  "contactUrl": "<string>",
  "displayName": "<string>",
  "firstName": "<string>",
  "avatarUrl": "<string>",
  "primaryPhone": "<string>",
  "primaryEmail": "<string>",
  "totalHours": "<double>",
  "timesVolunteered": "<integer>",
  "volunteerAttendanceUrl": "<string>",
  "volunteerOpportunityId": "<integer>",
  "volunteerOpportunityUrl": "<string>"
}