Here in the below code ,, i want to get feedback from payment_callback function inside payment_result function ,,, i try session ,, but it output NONE ,, any help please

@app.route('/payment/callback', methods=['POST'])
def payment_callback():
    global processed_transactions

    try:
        data = get_request_data()
        logger.info(f"Received data: {data}")

        response_status = decode_if_bytes(data.get('payment_result', {}).get('response_status'))
        if response_status:
            session['response_status'] = response_status
            logger.info(f"Callback session data: {dict(session)}")
        else:
            logger.warning("Response status not found in the received data.")

        return redirect(url_for('payment_result'))

    except Exception as e:
        logger.error(f"Error querying transaction: {e}")
        flash('Error querying transaction', 'danger')
        return redirect(url_for('index'))


@app.route('/payment/return', methods=['GET', 'POST'])
def payment_return():
    time.sleep(3)
    logger.info('------return--------')
    return redirect(url_for('payment_result'))

@app.route('/payment/result')
def payment_result():
    print('I want to get response status')

    response_status = session.get('response_status')
    print(response_status)  #output is NONE
    return render_template('Payment_Result.html')