Adding custom tax to Paid Memberships Pro and renaming to admin fees instead.

my_admin_fees_example.php

<?php

/**
 * This gist is to add a 20% fee on all orders and rename 'Tax' to 'Admin Fees'.
 * Please add this code to your PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 * www.paidmembershipspro.com
 */

/**
 * This function will add 20% to all orders using the 'pmpro_tax' filter.
 */
function my_admin_fee( $tax, $values, $order ) {

	// Work out 20% tax on current value.
	$tax = round( floatval( $values[ 'price' ] ) * 0.2, 2 );

  return $tax;

}
add_filter( 'pmpro_tax', 'my_admin_fee', 10, 3 );

/**
 * This will rename 'tax' to 'admin fees'
 */
function my_change_tax_to_admin_fees( $translated_text, $text, $domain ) {

        switch ( $translated_text ) {

            case 'Tax' :

                $translated_text = __( 'Admin Fees', 'paid-memberships-pro' );
                break;
        }


    return $translated_text;
}
add_filter( 'gettext', 'my_change_tax_to_admin_fees', 20, 3 );

/**
 * Adds a notice to checkout so users are aware of being charged the 20% fee.
 */
 function my_show_checkout_admin_fee_message() {
	echo '<strong><small>Please note that a 20% admin fee charge will be applied.</small></strong>'; 
 }
 add_action( 'pmpro_checkout_after_level_cost', 'my_show_checkout_admin_fee_message' );