$25 discount when renewing the same level in Paid Memberships Pro

my_pmpro_checkout_level_renewal_pricing.php

<?php   // do not copy this line.
/**
 * This recipe does will allow you to discount the price when someone renews at the same level for 1 level.
 * Change line 14 to the amount to be discounted, change line 16 level 1 to the level ID for your own level.
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

function my_pmpro_checkout_level_renewal_pricing($level)
{
	$discount = 70;	//change this

	if(pmpro_hasMembershipLevel('1') && $level->id == 1)	//might want to check for specific levels here
		$level->initial_payment = max(0, $level->initial_payment - $discount);

	return $level;
}
add_filter('pmpro_checkout_level', 'my_pmpro_checkout_level_renewal_pricing');