Create a custom field option. If the sort key is not supplied, it’ll default to 1000, so the option appears near the end of the list.
API key from your incident.io dashboard (Settings → API keys)
Created response.
{
"custom_field_id": "01FCNDV6P870EA6S7TK1DSYDG0",
"id": "01FCNDV6P870EA6S7TK1DSYDG0",
"sort_key": 10,
"value": "Product"
}