Set Custom Donation Receipt Page For Offline Donations

/**

 * You may want to use a different donation receipt page for Offline

 * donations than your other donations.

 *

 * In the example below, just set $custom_page to the URL or permalink

 * of the page you would like donors to be redirected to after

 * donating offline.

 *

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

 * @param   array  $args Set of arguments, including the donation ID.

 * @return  string Return the donation receipt URL for this donation.

 */

function ed_charitable_set_custom_donation_receipt_page_for_offline( $url, $args ) {

    // Get the donation ID.

    $donation_id = isset( $args['donation_id'] ) ? $args['donation_id'] : get_the_ID();

    // If this was not an offline donation, return the default URL.

    if ( 'offline' != get_post_meta( $donation_id, 'donation_gateway', true ) ) {

        return $url;

    }

    // Set the custom page link. Replace 123 with the ID of your custom page, or add a

    // hard-coded link like https://yoursite.com/custom-page/

    $custom_page = get_permalink( 123 );

    return esc_url_raw( add_query_arg( array( 'donation_id' => $donation_id ), $custom_page ) );

}

add_filter( 'charitable_permalink_donation_receipt_page', 'ed_charitable_set_custom_donation_receipt_page_for_offline', 10, 2 );