Adds shippingDetails and hasMerchantReturnPolicy to WooCommerce product Schema.org structured data output

woocommerce-structured-data-shippingdetails-hasmerchantreturnpolicy.php

<?php
// Don't include the PHP opening tag if PHP is already open.


add_filter(
	'woocommerce_structured_data_product_offer',
	function ( $markup_offer, $product ) {

		// Add shipping details.
		$markup_offer['shippingDetails'] = [
			'@type'               => 'OfferShippingDetails',
			'shippingRate'        => [
				'@type'    => 'MonetaryAmount',
				'value'    => '0',
				'currency' => get_woocommerce_currency(),
			],
			'shippingDestination' => [
				'@type'          => 'DefinedRegion',
				'addressCountry' => WC()->countries->get_base_country(),
			],
			'deliveryTime'        => [
				'@type'        => 'ShippingDeliveryTime',
				'handlingTime' => [
					'@type'    => 'QuantitativeValue',
					'minValue' => 0,
					'maxValue' => 1,
					'unitCode' => 'd',
				],
				'transitTime'  => [
					'@type'    => 'QuantitativeValue',
					'minValue' => 1,
					'maxValue' => 5,
					'unitCode' => 'd',
				],
			],
		];

		// Add merchant return policy.
		$markup_offer['hasMerchantReturnPolicy'] = [
			'@type'                => 'MerchantReturnPolicy',
			'applicableCountry'    => WC()->countries->get_base_country(),
			'returnPolicyCategory' => 'https://schema.org/MerchantReturnFiniteReturnWindow',
			'merchantReturnDays'   => 30,
			'returnMethod'         => 'https://schema.org/ReturnByMail',
			'returnFees'           => 'https://schema.org/FreeReturn',
		];

		return $markup_offer;
	},
	10,
	2,
);