add_filter( "rank_math/snippet/rich_snippet_product_entity", function( $entity ) {

	// Exit if 'offers' isn't set at all
	if ( ! isset( $entity['offers'] ) ) {
		return $entity;
	}

	// --- Define the policies once ---
	$return_policy = [
		'@type'              => 'MerchantReturnPolicy',
		'applicableCountry'  => 'IR',
		'returnPolicyCategory' => 'https://schema.org/MerchantReturnFiniteReturnWindow',
		'merchantReturnDays' => 7,
		'returnMethod'       => 'https://schema.org/ReturnByMail',
		'returnFees'         => 'https://schema.org/FreeReturn',
	];

	$shipping_details = [
		'@type'   => 'OfferShippingDetails',
		'shippingRate' => [
			'@type'    => 'MonetaryAmount',
			'value'    => 0,
			'currency' => 'IRR',
		],
		'shippingDestination' => [
			'@type'        => 'DefinedRegion',
			'addressCountry' => 'IR',
		],
	];
	// --- End Definitions ---

	// Check if 'offers' is an array of offers (e.g., variable product)
	if ( isset( $entity['offers'][0] ) ) {
		// Loop through each offer (for variable products)
		foreach ( $entity['offers'] as $key => $offer ) {
			$entity['offers'][ $key ]['hasMerchantReturnPolicy'] = $return_policy;
			$entity['offers'][ $key ]['shippingDetails']         = $shipping_details;
		}
	} else {
		// It's a single offer object (for simple products)
		$entity['offers']['hasMerchantReturnPolicy'] = $return_policy;
		$entity['offers']['shippingDetails']         = $shipping_details;
	}

	return $entity;
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