php - Auto adjust product tax class based on WooCommerce category

Solution:

Got it! There were a few issues. First off, apparently products are initialized by WordPress before CRUD sowoocommerce_new_product is pretty misleading. It's better to usewoocommerce_update_product.

Next up, when using that you will get in an infinite loop because every time you callsave(), the action runs again, so you need to remove your action and then add it again. See the final code below.

function change_tax_for_books( $id ) {
    $product = wc_get_product( $id );
    
    if( has_term( 133, 'product_cat', $id ) ) {
        $product->set_tax_class( 'Gereduceerd tarief' );
        remove_action( 'woocommerce_update_product', 'change_tax_for_books' );
        $product->save();
        add_action( 'woocommerce_update_product', 'change_tax_for_books' );
    }
}

add_action( 'woocommerce_update_product', 'change_tax_for_books' );
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