Customize the schema for WooCommerce products

woo-product-schema.php

<?php
/*
* This class will customize the WooCommerce product schema markup
*/
namespace HWID\Woo;

class CustomizeSchema {
  static function init() {
    add_filter( 'woocommerce_structured_data_product', [ 'HWID\Woo\CustomizeSchema', 'override_schema_markup' ], 10, 2 );
  }
  
	/**
	 * Remove pricing information from the schema for a product that's only available as a quote
	 *
	 * @param array $markup
	 * @param \WC_Product $product
	 *
	 * @return array
	 */
	static function override_schema_markup( $markup, $product ) {

		$availability = get_post_meta( $product->get_id(), '_product_availability', true );

		if ( $availability === 'quote' ) {
			$markup['offers'] = [];
		}

		return $markup;
	}
}