Set the $_REQUEST['level'] var early on specific URLs to help other PMPro Customizations

set_request_level_on_sitewide_sales_pages.php

/**
 * We need to set $_REQUEST['level'] early on our
 * sitewide sales pages to support other customizations.
 * We can't use is_page because WP isn't fully setup yet.
 * Update the $sitewide_sales_pages and $default_level_id as needed.
 * Add to a custom plugin.
 */
function set_request_level_on_sitewide_sales_pages() {
    $sitewide_sales_pages = array(
        'blackfriday',
        'cybermonday',
        'sitewide-sales-launch',
        'summer-sale',
    );
    $default_level_id = 1;

    // If it's already set, let's go with that.
    if( !empty( $_REQUEST['level'] ) ) {
        return;
    }

    foreach( $sitewide_sales_pages as $slug ) {
        if( strpos( $_SERVER['REQUEST_URI'], '/' . $slug ) !== false ) {
            $_REQUEST['level'] = $default_level_id;
            define( 'IS_SITEWIDE_SALE', true);
        }
    }
}
add_action( 'init', 'set_request_level_on_sitewide_sales_pages', 1 );