WooCommerce Measurement Price Calculator - add info above the calculator

sv-wcmpc-calculator-heading.php

/**
 * Example: checking if the calculator is being used for a product
 *
 * Adds a heading above the Measurement Price Calculator if enabled
 */
function sv_mpc_heading() {

	if ( ! class_exists( 'WC_Price_Calculator_Product' ) ) {
		return;
	}

	global $product;
	$measurement = WC_Price_Calculator_Product::calculator_enabled( $product );
	
	if ( $measurement ) {
		echo '<h4>Test Heading</h4>';
	}
}
add_filter( 'woocommerce_before_add_to_cart_button', 'sv_mpc_heading', 4 );