Award points for image link click

add_action( 'wp_footer', 'insert_img_click_points' );
function insert_img_click_points() {

    if ( ! is_user_logged_in() ) return;
?>

<script type="text/javascript">
jQuery(function($) {

    $( 'a#link img' ).click(function(){

        $.ajax({
            type       : "POST",
            data       : {
                action    : 'points-for-image-click',
                token     : <?php echo wp_create_nonce( 'points-for-image-click' ); ?>
            },
            url        : ajaxurl
        });

    });

});
</script>
<?php
}

/**
 * Ajax Call Handler
 * Whenever triggered, the user ID given for $admin_id receives
 * points.
 * Requires users to be logged in for points to be awarded.
 */
add_action( 'wp_ajax_points-for-image-click', 'award_points_for_click' );
function award_points_for_click() {

    // Security
    check_ajax_referer( 'points-for-image-click', 'token' );

    // Make sure myCRED is enabled
    if ( ! function_exists( 'mycred' ) ) die( 0 );

    // Point Type
    $point_type = 'mycred_default';

    // User to receive points
    $admin_id = 1;

    // Load myCRED
    $mycred = mycred( $point_type );

    // Award points
    $mycred->add_creds(
        'image_click',
        $author_id
        1,
        'Image click',
        0,
        '',
        $point_type
    );

}