Using AppcuesIdentity config object.

config.js

// Create a special global variable that the Appcues script will look for upon load.
// Admittedly, this should probably be called "AppcuesConfig".
window.AppcuesIdentity = window.AppcuesIdentity || {
    appcuesId: 'foo',
    userId: 1234,
    userEmail: '[email protected]'
};

// Asynchronously load Appcues embed script.
asyncLoadAppcues().then(function() {
    // Initialize.
    Appcues.init();

    // Optionally, call Appcues.identify() to pass more properties.
    Appcues.identify({name: 'Tim', favorite_color: 'red'});
});