curl --request POST \
  --url {protocol}://{host}/wp-json/cocart/v1/calculate/shipping \
  --header 'Content-Type: application/json' \
  --data '
{
  "country": "<string>",
  "state": "<string>",
  "city": "<string>",
  "postcode": "<string>",
  "return_methods": false
}
'

"<string>"