WooCommerce conditionally redirect users after add to cart - Shipping class

woocommerce-conditionally-redirect-users-after-add-to-cart-shipping-class.php

<?php
/**
 * Redirect users after add to cart.
 */
function my_custom_add_to_cart_redirect( $url ) {
	if ( ! isset( $_REQUEST['add-to-cart'] ) || ! is_numeric( $_REQUEST['add-to-cart'] ) ) {
		return $url;
	}
	$product_id = apply_filters( 'woocommerce_add_to_cart_product_id', absint( $_REQUEST['add-to-cart'] ) );
	// Only redirect products with the 'small-item' shipping class
	if ( has_term( 'small-item', 'product_shipping_class', $product_id ) ) {
		$url = WC()->cart->get_checkout_url();
	}
	return $url;
}
add_filter( 'woocommerce_add_to_cart_redirect', 'my_custom_add_to_cart_redirect' );
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