I want to always have the same fee per product

Hey Eric,

Yep, but it’d be more efficient to not use this plugin. Could just add a little snippet to your child theme’s functions.php file to add a fee to each order:

function woo_add_cart_fee() {
	WC()->cart->add_fee( __('Custom', 'woocommerce'), 5 );
}
add_action( 'woocommerce_cart_calculate_fees', 'woo_add_cart_fee' );

Hey Eric,

Oh, no that would just be a one-time fee regardless of the products in the cart. If you need to fee the multiply by the number of products in the cart, this snippet should do the trick:

function woo_add_cart_fee() {
	$cart_quantity = WC()->cart->cart_contents_count;
	$fee_cost = 5;

	WC()->cart->add_fee( __('Custom Fee', 'woocommerce'), $fee_cost * $cart_quantity );
}
add_action( 'woocommerce_cart_calculate_fees', 'woo_add_cart_fee' );