curl --request DELETE \
  --url https://sandbox.tight.com/v6/invoicing/itemTemplates/{id} \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "id": "tili_28868401",
    "name": "Standard Service Fee",
    "status": "ACTIVE",
    "description": "Standard hourly service fee",
    "amount": 5000,
    "quantity": "1.0",
    "price": "50.0",
    "salesTax": {
      "value": "8.875",
      "type": "PERCENT"
    },
    "glAccount": {},
    "customData": {
      "internal_key": "some_internal_key",
      "some_other_field": 23434
    }
  }
}