curl --request POST \
  --url https://api.virtuoussoftware.com/api/ContactIndividual/{contactIndividualId}/Avatar \
  --header 'Authorization: Bearer <token>'

{
  "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>",
  "createdByUser": "<string>",
  "modifiedDateTimeUtc": "<dateTime>",
  "modifiedByUser": "<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>"
        }
      ]
    }
  ]
}