curl --request GET \
  --url {protocol}://{host}/wp-json/cocart/v1/customer

{
  "user": {
    "ID": 123,
    "first_name": "<string>",
    "last_name": "<string>"
  },
  "billing": {
    "first_name": "<string>",
    "last_name": "<string>",
    "company": "<string>",
    "email": "<string>",
    "phone": "<string>",
    "country": "<string>",
    "state": "<string>",
    "postcode": "<string>",
    "city": "<string>",
    "address": "<string>",
    "address_1": "<string>",
    "address_2": "<string>"
  },
  "shipping": {
    "first_name": "<string>",
    "last_name": "<string>",
    "company": "<string>",
    "country": "<string>",
    "state": "<string>",
    "postcode": "<string>",
    "city": "<string>",
    "address": "<string>",
    "address_1": "<string>",
    "address_2": "<string>"
  },
  "has_calculated_shipping": true,
  "is_vat_exempt": "<string>"
}