onDesignClose

(async () => {
  const api = await Canva.Partnership.initialize({
    apiKey: "<partner_api_key>",
    autoAuthToken: "<auto_auth_token>",
    container: document.getElementById("container"),
  });

  const onDesignClose = () => {
    // the user has closed the Canva editor
    console.log("You closed the Canva editor!");
  };

  const onProductSelect = (opts) => {
    api.createDesign({
      ...opts,
      onDesignClose,
    });
  };

  api.showCatalog({
    onProductSelect,
  });
})();