curl --request GET \
  --url https://api.numeralhq.com/tax/products/{reference_product_id} \
  --header 'Authorization: Bearer <token>'

{
  "object": "tax.product",
  "reference_product_id": "p-20506",
  "reference_product_name": "Red Shoes",
  "product_category": "CLOTHING_GENERAL",
  "created_at": 1721694425,
  "updated_at": 1721694425,
  "testmode": "true"
}