Default to the blackfriday discount code if none is set. Paid Memberships Pro

init_default_pmpro_discount_code.php

/*
	Default to the blackfriday discount code if none is set.
	Add this code to a custom plugin.
*/
function init_default_pmpro_discount_code() {
	//edit and uncoment this line to limit this to a specific page; note that "is_page" won't work yet
	//if(strpos($_SERVER['REQUEST_URI'], '/blackfriday') === false) return;
	
	if(!isset($_REQUEST['discount_code'])) {
		$_REQUEST['discount_code'] = 'blackfriday';
	}

	//default to level 1 as well
	if(!isset($_REQUEST['level'])) {
		$_REQUEST['level'] = 1;
	}
}
add_action('init', 'init_default_pmpro_discount_code', 1);