Add a custom fee for percentage and fixed cost to specific payment gateway in WooCommerce

Question

In WooCommerce I need to apply a custom handling fee for a specific payment gateway.

A custom handling fee for percentage cost and a custom handling for per fixed cost.

I have this 2 pieces of codes:

A) PERCENTAGE COST - function

/************************************************************/
/*  PERCENTACE COST 
**/
// Add a custom fee based o cart subtotal
// Add a custom fee based o cart subtotal

add_action( 'woocommerce_cart_calculate_fees', 'custom_percentage_fee', 20, 1 );
function custom_percentage_fee ( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    if ( ! ( is_checkout() && ! is_wc_endpoint_url() ) )
        return; // Only checkout page

    $payment_method = WC()->session->get( 'chosen_payment_method' );

    if ( 'cod' == $payment_method ) {
        $surcharge = $cart->subtotal * 0.025;
        $cart->add_fee( 'Percentage Cost', $surcharge, true );
    }
}

// jQuery - Update checkout on methode payment change  
add_action( 'wp_footer', 'custom_checkout_jqscript' );
function custom_checkout_jqscript() {
    if ( ! ( is_checkout() && ! is_wc_endpoint_url() ) )
        return; // Only checkout page
    ?>
    <script type="text/javascript">
    jQuery( function($){
        $('form.checkout').on('change', 'input[name="payment_method"]', function(){
            $(document.body).trigger('update_checkout');
        });
    });
    </script>
    <?php
}

Result frontend

B) FIXED COST - function

/************************************************************/
/*  FIXED COST 
**/
// Add a custom fee based o cart subtotal
add_action( 'woocommerce_cart_calculate_fees', 'custom_fixed_fee', 10, 1 );
function custom_fixed_fee ( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    if ( 'cod' === WC()->session->get('chosen_payment_method') ) {
        $fee = 0.31;
        $cart->add_fee( 'Fixed Cost', $fee, true );
    }
}

// jQuery - Update checkout on methode payment change
add_action( 'wp_footer', 'custom_checkout_jqscript' );
function custom_checkout_jqscript() {
    if ( is_checkout() && ! is_wc_endpoint_url() ) :
    ?>
    <script type="text/javascript">
    jQuery( function($){
        $('form.checkout').on('change', 'input[name="payment_method"]', function(){
            $(document.body).trigger('update_checkout');
        });
    });
    </script>
    <?php
    endif;
}

Result frontend

The two distinct functions work perfectly separately. Now, I would like to combine the two functions to get the sum of the two costs.

My code attempt (A + B): function evolution with addition other payment systems

add_action( 'woocommerce_cart_calculate_fees', 'custom_percentage_fee', 20, 1 );
function custom_percentage_fee ( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

     if ( ! ( is_checkout() && ! is_wc_endpoint_url() ) )
        return; // Only checkout page

    $payment_method = WC()->session->get( 'chosen_payment_method' );

     if ( 'stripe' == $payment_method ) {
        $surcharge = $cart->subtotal * 0.025;
        $fee = 0.31;
    } 
     if ( 'paypal_credit_card_rest' == $payment_method ) {
        $surcharge = $cart->subtotal * 0.036;
        $fee = 0.35;
    }
     if ( 'paypal_express' == $payment_method ) {
        $surcharge = $cart->subtotal * 0.036;
        $fee = 0.35;
    }
     if ( 'bacs' == $payment_method ) {
        return;
    }
  
      $together = $surcharge + $fee;
      $cart->add_fee( 'Plus Cost', $together, true );
}


// jQuery - Update checkout on methode payment change  
add_action( 'wp_footer', 'custom_checkout_jqscript' );
function custom_checkout_jqscript() {
    if ( ! ( is_checkout() && ! is_wc_endpoint_url() ) )
        return; // Only checkout page
    ?>
    <script type="text/javascript">
    jQuery( function($){
        $('form.checkout').on('change', 'input[name="payment_method"]', function(){
            $(document.body).trigger('update_checkout');
        });
    });
    </script>
    <?php
}

The function returns the following errors:

Notice: Undefined variable: surcharge in /MY-FOLDER..../snippet-ops.php(446) : eval()'d code on line 79

Notice: Undefined variable: fee in /MY FOLDER..../snippet-ops.php(446) : eval()'d code on line 79

That is exactly here:

$together = $surcharge + $fee;

Result frontend

Any advice on how to combine the 2 codes above into 1?

If an if condition is met, the variables will be set. However, if this is not the case, you will get the error message 'Undefined variable'. You can solve this by using if / elseif / else where the variables are set in the else condition. You can also use the php isset function or for the if conditions set the variables with a standard value. — 7uc1f3r

7uc1f3r 7uc1f3r · Accepted Answer · 2020-02-17T20:19:48

The difference between the 2 examples you've posted is really minimal. You can just use:

if ( 'cod' == $payment_method ) {
    $surcharge = $cart->subtotal * 0.025;
    $fee = 0.31;

    $together = $surcharge + $fee;
    $cart->add_fee( 'Plus Cost', $together, true );
}

Add a custom fee for percentage and fixed cost to specific payment gateway in WooCommerce

1 Answers