buycred – buyers pay paypal fees?

I want the user to pay the paypal fee when they buy points using the buycred form. I figured I could just edit the example for mycred_buycred_get_cost that is in the docs, but I copied all three examples exactly into my theme’s function.php and it breaks (no price shows up at all in the paypal popup).

Paypal fees are 3.49% + $.49 So I figured this code below would work. But again, simply no price shows up at all in the paypal confirmation popup.

/**
 * Buyer pays PayPal fees for custom point purchases

 */
add_filter( 'mycred_buycred_get_cost', 'mycredpro_buycred_user_pays_fees', 10, 3 );
function mycredpro_buycred_user_pays_fees( $cost, $type ) {

	if ( $type != 'mycred_default' ) return $cost;

	// paypal fees
	$percent_fee = 3.49;
    $set_fee = .49;

	// Get the percentage
	$percent = round( ( ( $percent_fee / 100 ) * $cost ) );

	// Deduct the discount amount
	$cost = $cost + $percent + $set_fee;

	return $cost;

}

Any help would be greatly appreciated.