AdminCreateTaxRate

{
    "name": "VAT",
    "tax_region_id": "string",
    "rate": 10,
    "code": "string",
    "rules": [
        {
            "reference": "product_type",
            "reference_id": "ptype_123"
        }
    ],
    "is_default": true,
    "metadata": {},
    "is_combinable": true
}