Set price_id to download default if license is expired for over 3 months

renew-expired-licenses-with-deafult-price-id.php

<?php

add_filter( 'edd_add_to_cart_item', 'update_price_id_during_renewal_if_license_expired_past_3_months', 10, 1 );

/**
 * Update the price_id to the download's default if the license is expired by 3 months
 *
 * @param $item
 *
 * @return array the item
 */
function update_price_id_during_renewal_if_license_expired_past_3_months( $item ) {

	$download_id = $item['id'];
	$options     = $item['options'];

	// Product being added to the cart is not a renewal
	if ( ! isset( $options['is_renewal'] ) || ! isset( $options['license_key'] ) || ! isset( $options['license_id'] ) ) {
		return $item;
	}

	$license = edd_software_licensing()->get_license( $options['license_id'] );

	// License is not expired or there is no expiration date
	if ( ! $license || ! $license->is_expired() || ! $license->expiration ) {
		return $item;
	}

	try {
		$expiration_date = new DateTime('now', wp_timezone() );
		$expiration_date->setTimestamp( $license->expiration );
		$expiration_date->modify( '+3 months' );
	} catch ( Exception $exception ) {
		return $item;
	}

	// current date is withing 3 months of expiration date
	if ( $expiration_date->getTimestamp() > time() ) {
		return $item;
	}

	// Set the price id to the default variable price
	$options['price_id'] = edd_get_default_variable_price( $download_id );

	$item['options'] = $options;

	return $item;
}