Add another callback URL to the WP-Auth0 plugin

wp-auth0-callback.php

<?php
function namespace_add_auth0_callback_rewrite() {
    add_rewrite_rule('^auth0/callback$', 'index.php?auth0=1', 'top');
}
add_action('init', 'namespace_add_auth0_callback_rewrite');

function namespace_add_auth0_callback_param( $params ) {
    $params['redirect_uri'] = home_url( '/auth0/callback' );
    return $params;
}
add_filter( 'auth0_authorize_url_params', 'namespace_add_auth0_callback_param' );