curl --request POST \
  --url https://api.example.com/iser/insert \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "email": "<string>",
  "firstName": "<string>",
  "lastName": "<string>",
  "browserCode": "<string>",
  "countryAbbreviation": null,
  "phoneNumber": null,
  "whatsAppCountryAbbreviation": null,
  "whatsAppNumber": null,
  "timezoneOffset": 1,
  "birthMonth": null,
  "birthYear": null
}
'

{
  "success": true,
  "data": "<unknown>"
}