example.tex

\documentclass{article}

\usepackage[utf8]{inputenc}
\input{gql.tex}

\begin{document}

\begin{gql}
mutation updateCheckoutShippingOptions(
  $checkoutId: ID!
  $shippingMethodId: ID!
) {
  checkoutShippingMethodUpdate(
    checkoutId: $checkoutId
    shippingMethodId: $shippingMethodId
  ) {
    errors {
      field
      message
      __typename
    }
    checkout {
      ...Checkout
      __typename
    }
    __typename
  }
}
\end{gql}

\end{document}