Grandfather Renewal Rate

/*

 * Sets renewal discount to 40% for any customer that purchased before April 18, 2016

 */

function pw_edd_grandfather_renewal_discount( $renewal_discount, $license_id ) {

	$license = edd_software_licensing()->get_license( $license_id );

	if( strtotime( $license->date_created ) < strtotime( 'January 1, 2020' ) ) {

		$renewal_discount = 40;

	}

	return $renewal_discount;

}

add_filter( 'edd_sl_renewal_discount_percentage', 'pw_edd_grandfather_renewal_discount', 10, 2 );