curl --request POST \
  --url https://api.hyperline.co/v1/custom-properties \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "name": "<string>",
  "type": "date",
  "slug": "<string>",
  "entities": [
    "customer"
  ],
  "api_only": false,
  "authorized_values": [
    "<string>"
  ]
}'

{
  "id": "cfi_efnjehRH304",
  "name": "Test custom property",
  "slug": "test_custom_property",
  "type": "date",
  "entities": [
    "customer"
  ],
  "authorized_values": [
    "<string>"
  ],
  "api_only": false,
  "created_at": "2024-01-01T22:00:00Z",
  "updated_at": "2024-01-01T22:00:00Z"
}