extend schema
  @link(
    url: "https://specs.apollo.dev/federation/v2.3"
    import: ["@key", "@external", "@requires"]
  )

type Product @key(fields: "upc") {
  upc: String!
  weight: Int @external
  price: Int @external
  inStock: Boolean
  shippingEstimate: Int @requires(fields: "price weight")
}