custom-add-to-cart-conversion.php

<?php

/**
 * Track custom add-to-cart conversions using the WooCommerce Pixel Manager
 *
 * Add this to your functions.php file
 */

add_action('wp_footer', function () {
	?>
	<script>
		jQuery(document).on("wpmAddToCart", function (event, product) {

			gtag("event", "conversion", {
				send_to       : "CONVERSION_ID/CONVERSION_LABEL",
        			// any value you want or
				value: 0.00,
        			// you could also calculate the product price times product quantity
        			value: product.price * product.quantity,
        			currency: "USD",
			})
		})
	</script>
	<?php
});