I’m using the Give plugin for WordPress. They have a proof-of-concept pluginn that allows adding a fee at checkout https://github.com/WordImpress/Give-Snippet-Library/blob/master/form-customizations/basic-fees.php

This works as expected and have no problems there, but what I’m trying to do is make the fee optional so the donor can choose from the front-end whether or not they want to add that fee.

Here’s the part of the code that creates the new donation amout:

function give_basic_fees_add_fee( $sanitized_amount ) {
    $fee_percentage = (int) give_get_option( 'basic_fee_percentage' );
    $fee            = $sanitized_amount * ( $fee_percentage / 100 );
    $new_total      = $fee + $sanitized_amount;
    return $new_total;
add_filter( 'give_donation_total', 'give_basic_fees_add_fee', 1, 1 );

What I’m trying to do is call this with Ajax. I tried the below, which is not working:


//Use Ajax to see if user checked fee box before submitting
//I've already confirmed this part of the script is loading in the footer.
            function check_for_fees(){
                var checked;
                else {
                var data = {
                    'action': 'give_basic_fees_add_fee',
                    'checked': checked
                $.post(ajaxurl, data, function(response) {
                    alert('Got this from the server: ' + response);


add_action('wp_axaj_give_basic_fees_add_fee', 'give_basic_fees_add_fee');
add_action('wp_axaj_nopriv_give_basic_fees_add_fee', 'give_basic_fees_add_fee');
function give_basic_fees_add_fee( $sanitized_amount ) {

    /*I just want to alert "Checked" so I know it's working, and create
    additional conditional code depending on the value of "checked".*/
    $checked        = intval($_POST['checked']);
    echo $checked;


Read more here: Call WordPress filter action with Ajax


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