curl --request POST \
  --url https://app.fliqr.ai/api/accounts/custom_fields \
  --header 'Content-Type: application/json' \
  --header 'X-ACCESS-TOKEN: <api-key>' \
  --data '
{
  "name": "lead_score",
  "type": 1
}
'

{
  "id": 1995,
  "name": "lead_score"
}