curl --request POST \
  --url http://localhost/api/v3/rates/product-variant-estimate \
  --header 'Content-Type: application/json' \
  --data '
{
  "definition": "<string>",
  "sku": "<string>",
  "external_id": "<string>",
  "barcode": "<string>",
  "location_id": 123,
  "region": "<string>",
  "country": "<string>"
}
'

{
  "data": {
    "name": "<string>",
    "handle": "<string>",
    "rate": "<string>",
    "location": "<string>",
    "code": "<string>",
    "region_id": 123,
    "country_iso_2": "<string>",
    "priority": "<string>"
  }
}