curl --request GET \
  --url https://api.virtuoussoftware.com/api/Contact/{contactId} \
  --header 'Authorization: Bearer <token>'

{
  "isCurrentUserFollowing": "<boolean>",
  "id": "<integer>",
  "contactType": "<string>",
  "isPrivate": "<boolean>",
  "name": "<string>",
  "informalName": "<string>",
  "description": "<string>",
  "website": "<string>",
  "maritalStatus": "<string>",
  "anniversaryMonth": "<integer>",
  "anniversaryDay": "<integer>",
  "anniversaryYear": "<integer>",
  "mergedIntoContactId": "<integer>",
  "address": {
    "id": "<integer>",
    "label": "<string>",
    "address1": "<string>",
    "address2": "<string>",
    "city": "<string>",
    "state": "<string>",
    "postal": "<string>",
    "country": "<string>",
    "isPrimary": "<boolean>",
    "canBePrimary": "<boolean>",
    "startMonth": "<integer>",
    "startDay": "<integer>",
    "endMonth": "<integer>",
    "endDay": "<integer>"
  },
  "giftAskAmount": "<string>",
  "giftAskType": "<string>",
  "lifeToDateGiving": "<string>",
  "yearToDateGiving": "<string>",
  "lastGiftAmount": "<string>",
  "lastGiftDate": "<string>",
  "contactIndividuals": [
    {
      "id": "<integer>",
      "contactId": "<integer>",
      "prefix": "<string>",
      "firstName": "<string>",
      "middleName": "<string>",
      "lastName": "<string>",
      "suffix": "<string>",
      "gender": "<string>",
      "isPrimary": "<boolean>",
      "canBePrimary": "<boolean>",
      "isSecondary": "<boolean>",
      "canBeSecondary": "<boolean>",
      "birthMonth": "<integer>",
      "birthDay": "<integer>",
      "birthYear": "<integer>",
      "birthDate": "<string>",
      "approximateAge": "<integer>",
      "isDeceased": "<boolean>",
      "passion": "<string>",
      "avatarUrl": "<string>",
      "contactMethods": [
        {
          "id": "<integer>",
          "type": "<string>",
          "value": "<string>",
          "isOptedIn": "<boolean>",
          "isPrimary": "<boolean>",
          "canBePrimary": "<boolean>"
        },
        {
          "id": "<integer>",
          "type": "<string>",
          "value": "<string>",
          "isOptedIn": "<boolean>",
          "isPrimary": "<boolean>",
          "canBePrimary": "<boolean>"
        }
      ],
      "createDateTimeUtc": "<dateTime>",
      "modifiedDateTimeUtc": "<dateTime>",
      "customFields": [
        {
          "name": "<string>",
          "value": "<string>",
          "displayName": "<string>"
        },
        {
          "name": "<string>",
          "value": "<string>",
          "displayName": "<string>"
        }
      ],
      "customCollections": [
        {
          "customCollectionId": "<integer>",
          "customCollectionName": "<string>",
          "collectionInstanceId": "<integer>",
          "fields": [
            {
              "name": "<string>",
              "value": "<string>"
            },
            {
              "name": "<string>",
              "value": "<string>"
            }
          ]
        },
        {
          "customCollectionId": "<integer>",
          "customCollectionName": "<string>",
          "collectionInstanceId": "<integer>",
          "fields": [
            {
              "name": "<string>",
              "value": "<string>"
            },
            {
              "name": "<string>",
              "value": "<string>"
            }
          ]
        }
      ]
    },
    {
      "id": "<integer>",
      "contactId": "<integer>",
      "prefix": "<string>",
      "firstName": "<string>",
      "middleName": "<string>",
      "lastName": "<string>",
      "suffix": "<string>",
      "gender": "<string>",
      "isPrimary": "<boolean>",
      "canBePrimary": "<boolean>",
      "isSecondary": "<boolean>",
      "canBeSecondary": "<boolean>",
      "birthMonth": "<integer>",
      "birthDay": "<integer>",
      "birthYear": "<integer>",
      "birthDate": "<string>",
      "approximateAge": "<integer>",
      "isDeceased": "<boolean>",
      "passion": "<string>",
      "avatarUrl": "<string>",
      "contactMethods": [
        {
          "id": "<integer>",
          "type": "<string>",
          "value": "<string>",
          "isOptedIn": "<boolean>",
          "isPrimary": "<boolean>",
          "canBePrimary": "<boolean>"
        },
        {
          "id": "<integer>",
          "type": "<string>",
          "value": "<string>",
          "isOptedIn": "<boolean>",
          "isPrimary": "<boolean>",
          "canBePrimary": "<boolean>"
        }
      ],
      "createDateTimeUtc": "<dateTime>",
      "modifiedDateTimeUtc": "<dateTime>",
      "customFields": [
        {
          "name": "<string>",
          "value": "<string>",
          "displayName": "<string>"
        },
        {
          "name": "<string>",
          "value": "<string>",
          "displayName": "<string>"
        }
      ],
      "customCollections": [
        {
          "customCollectionId": "<integer>",
          "customCollectionName": "<string>",
          "collectionInstanceId": "<integer>",
          "fields": [
            {
              "name": "<string>",
              "value": "<string>"
            },
            {
              "name": "<string>",
              "value": "<string>"
            }
          ]
        },
        {
          "customCollectionId": "<integer>",
          "customCollectionName": "<string>",
          "collectionInstanceId": "<integer>",
          "fields": [
            {
              "name": "<string>",
              "value": "<string>"
            },
            {
              "name": "<string>",
              "value": "<string>"
            }
          ]
        }
      ]
    }
  ],
  "contactGiftsUrl": "<string>",
  "contactPassthroughGiftsUrl": "<string>",
  "contactPlannedGiftsUrl": "<string>",
  "contactRecurringGiftsUrl": "<string>",
  "contactImportantNotesUrl": "<string>",
  "contactNotesUrl": "<string>",
  "contactTagsUrl": "<string>",
  "contactRelationshipsUrl": "<string>",
  "primaryAvatarUrl": "<string>",
  "contactReferences": [
    {
      "source": "<string>",
      "id": "<string>"
    },
    {
      "source": "<string>",
      "id": "<string>"
    }
  ],
  "originSegmentId": "<integer>",
  "originSegment": "<string>",
  "createDateTimeUtc": "<dateTime>",
  "createdByUser": "<string>",
  "modifiedDateTimeUtc": "<dateTime>",
  "modifiedByUser": "<string>",
  "tags": [
    "<string>",
    "<string>"
  ],
  "organizationGroups": [
    "<string>",
    "<string>"
  ],
  "customFields": [
    {
      "name": "<string>",
      "value": "<string>",
      "displayName": "<string>"
    },
    {
      "name": "<string>",
      "value": "<string>",
      "displayName": "<string>"
    }
  ],
  "customCollections": [
    {
      "customCollectionId": "<integer>",
      "customCollectionName": "<string>",
      "collectionInstanceId": "<integer>",
      "fields": [
        {
          "name": "<string>",
          "value": "<string>"
        },
        {
          "name": "<string>",
          "value": "<string>"
        }
      ]
    },
    {
      "customCollectionId": "<integer>",
      "customCollectionName": "<string>",
      "collectionInstanceId": "<integer>",
      "fields": [
        {
          "name": "<string>",
          "value": "<string>"
        },
        {
          "name": "<string>",
          "value": "<string>"
        }
      ]
    }
  ]
}