curl --request GET \
  --url https://provider.api.nadles.com/v0/customers/{customerId} \
  --header 'nadles-provider-key: <api-key>'

{
  "id": "<string>",
  "name": "<string>",
  "email": "<string>",
  "external_id": "<string>",
  "billing_address_line1": "<string>",
  "billing_address_line2": "<string>",
  "billing_address_city": "<string>",
  "billing_address_country_code": "<string>",
  "billing_address_zip_code": "<string>",
  "billing_address_region": "<string>",
  "is_business": true,
  "business_name": "<string>",
  "company_number": "<string>",
  "tax_identifier": "<string>"
}