Allow members to renew at a discounted rate if they have expired within 3 months.

grace_period_discount_pmpro_checkout_level.php

<?php
/*
 * Allow members to renew at a discounted rate if they have expired within 3 months.
 *
 */
/*
 * Allow members to renew at a discounted rate if they have expired within 3 months.
 *
 */
function grace_period_discount_pmpro_checkout_level( $level ) {
	global $current_user, $discount_code, $wpdb;
		
	// Discount does not apply new users.
	if ( empty( $current_user->ID ) ) {
		return $level;
	}
	
	// Discount does not apply if using a discount code.
	if ( ! empty( $discount_code ) || ! empty( $_REQUEST['discount_code'] ) ) {
		return $level;
	}

	// Calculate appropriate price if user is logged in and checking out for level ID 1.
	if ( $level->id == 1 && is_user_logged_in()) {
		// Set cutoff date for last 3 months.
		$grace_period_cutoff = date( 'Y-m-d H:i:s', strtotime( '-3 months', current_time( 'timestamp' ) ) );
		
		// Check if they had a discount in the past.
		$grace_period_discount = $wpdb->get_var( "SELECT id 
			FROM $wpdb->pmpro_memberships_users 
			WHERE user_id = {$current_user->ID} 
			AND status NOT IN('active') 
			AND enddate > '{$grace_period_cutoff}' 
			ORDER BY id DESC 
			LIMIT 1");
		
		// Discount their renewal if conditions are met.
		if ( ! empty( $grace_period_discount ) ) {
			$level->initial_payment = '50.00';
			$level->billing_amount = '50.00';
			return $level;
		}		
	} else {
		return $level;
	}
}
add_filter( 'pmpro_checkout_level', 'grace_period_discount_pmpro_checkout_level', 5);