curl --request POST \
  --url https://pub-api.conversion.ai/api/v1/contacts/batch \
  --header 'Content-Type: application/json' \
  --data '
{
  "batch": [
    {
      "audienceId": "<string>",
      "companyId": "<string>",
      "createdAt": "<string>",
      "email": "<string>",
      "id": "<string>",
      "subscriptionStatus": "SUBSCRIBED",
      "syncToCrm": true,
      "variables": {}
    }
  ]
}
'

{
  "data": true,
  "httpStatus": 123,
  "message": "<string>"
}