myCRED Add message to transfers

/**
 * Adjust Transfers
 */
add_filter( 'mycred_add', 'mycred_pro_custom_transfer_message', 99, 3 );
function mycred_pro_custom_transfer_message( $reply, $request, $mycred ) {
    // If declined or not a transfer, bail
    if ( $reply === false || $request['ref'] != 'transfer' ) return $reply;

    // We want to insert the message to the recipient
    // Recipients can be identified by a positive value
    // as the sender will have a negative one.
    // This is not needed if you want to show the message to
    // both the sender and the recipient!
    if ( $request['amount'] > 0 ) {

        // Sanitize the message (also removed all html elements)
        $message = sanitize_text_field( $_POST['message_to_recipient'] );

        // Add points now
        $mycred->update_balance( $request['user_id'], $request['amount'] );

        // Add custom log entry
        // In this example we will append the message to the end
        // of the log entry but you could also just use a custom
        // template tag that you replace with the message i.e. %message%
        $mycred->add_to_log(
            $request['ref'],
            $request['user_id'],
            $request['amount'],
            $request['entry'] . $message,
            $request['ref_id'],
            $request['data'],
            $request['type']
        );

        // Since we just added points we need to return
        // "done" to prevent duplicates!!!
        return 'done';
    }

    // Always return a reply or you brake things
    return $reply;
}