mutation createPaypalExpressToken(
  $cart_id: String!
  $return_url: String!
  $cancel_url: String!
) {
  createPaypalExpressToken(
    input: {
      cart_id: $cart_id
      code: "paypal_express"
      express_button: true
      urls: { return_url: $return_url, cancel_url: $cancel_url }
    }
  ) {
    token
    paypal_urls {
      start
      edit
    }
  }
}