curl --request POST \
  --url https://api.rallyuxr.com/api/public/v1/studies/{studyId}/participants/import \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "people": [
    {
      "email": "dev@rallyuxr.com",
      "firstName": "Dev",
      "lastName": "Rally",
      "isOptedOut": false,
      "lastContactDate": "2025-01-01",
      "additionalEmails": [
        "dev+1@rallyuxr.com"
      ],
      "properties": [
        {
          "propertyId": "cm0b4eokq000vbbsimwelll3u",
          "value": "2025-01-01"
        },
        {
          "name": "Favorite Color",
          "propertyType": "STRING",
          "value": "Blue"
        }
      ]
    }
  ]
}'

{
  "message": "<string>",
  "count": 123,
  "importId": "<string>"
}