componentDidMount() {
    window
      .fetch("https://connect.stripe.com/oauth/token", {
        method: "post",
        headers: {
          Accept: "application/json",
        },
        body: JSON.stringify({
          code: this.props.query.code,
          grant_type: "authorization_code"
        })
      })
      .then(response => console.log(response));
  }