this.credit = credit;
    }

    /**
     * Gets the credit charge for this message.
     *
     * @return the creditCharge
     */
    public final int getCreditCharge() {
        return this.creditCharge;
    }

    @Override
    public void retainPayload() {
        this.retainPayload = true;
    }

    @Override
    public boolean isRetainPayload() {