Change Donation Cancellation Url

/**

 * Change the URL that donors are returned to when they cancel their donation.

 *

 * @param  string $url  The default donation cancellation URL.

 * @param  array  $args Mixed arguments.

 * @return string

 */

function ed_charitable_set_donation_cancellation_url( $url, $args ) {

    /* A donation ID must be provided. */

    if ( ! array_key_exists( 'donation_id', $args ) ) {

        return $url;

    }

    return esc_url_raw( add_query_arg( array(

        'donation_id' => $args['donation_id'],

        'cancel'      => true,

    ), 'http://charitable.local/cancel/' ) );

}

add_filter( 'charitable_permalink_donation_cancellation_page', 'ed_charitable_set_donation_cancellation_url', 10, 2 );

/**

 * Check whether this is the donation cancellation page.

 *

 * @return boolean

 */

function ed_charitable_is_donation_cancellation_page() {

    global $wp_query;

    return array_key_exists( 'donation_id', $wp_query->query_vars )

        && array_key_exists( 'cancel', $wp_query->query_vars )

        && $wp_query->query_vars['cancel'];

}

add_filter( 'charitable_is_page_donation_cancellation_page', 'ed_charitable_is_donation_cancellation_page', 10, 2 );