Subscriptions show recurring totals on PIP invoices

Appends the WooCommerce Subscriptions recurring total onto all WooCommerce PIP (Print Invoice and Packing list) plugin documents.

add_action( 'wc_pip_after_body', function( $type, $action, $document, $order ) {

	// Require Woo Subscriptions
	if( ! function_exists( 'wcs_order_contains_subscription' ) ) {
		return;
	}

	// Require Subscription Order (Parent Or Renewal)
	if( ! wcs_order_contains_subscription( $order, [ 'parent', 'renewal' ] ) ) {
		return;
	}

	// Get Subscription Record
	$subscriptions = wcs_get_subscriptions_for_order( $order->get_id() );
	if( ! $subscriptions ) { return; }

	// Get Recurring Total
	foreach( $subscriptions as $subscription_id => $subscription ) {

		// Skip One Time Subscriptions
		if( $subscription->is_one_payment() ) { continue; }

		// Get Subscription Details
		$renewal_total += $subscription->get_total();
		$renewal_date = $subscription->get_date( 'next_payment' );
		if( ! $renewal_total || ! $renewal_date ) { continue; }

		// Print
		printf(
			"
				<h2>%s</h2>
				<p>Renewal is scheduled to charge %s on %s.</p>
			",
			'Recurring Total',
			wc_price( $renewal_total ),
			date( 'm/d/Y', strtotime( $renewal_date ) )
		);

	}

}, 10, 4 );
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