我试图保存一些信息在数据库中，如果事务成功，在stripe\u webhook视图。但并不成功。是不是数据不能直接保存在webhook中？真让我沮丧。我在线查看了示例代码，但找不到为成功事务插入或更新数据库的代码。

from site.models import Post, Chapter, Order
import stripe
from sqlalchemy import desc

@posts.route("/paynow")
@login_required
def paynow():
    return render_template('paynow.html',)

@posts.route('/stripe_pay')
@login_required
def stripe_pay():
    amt = 10000
    stripe.api_key = current_app.config['STRIPE_SECRET_KEY']
    session = stripe.checkout.Session.create(
        payment_method_types=['card'],
        line_items=[{
            'price_data': {
            'currency': 'usd',
            'product_data': {
            'name': 'T-shirt',
            },
            'unit_amount': amt,
            },
            'quantity': 1,
        }],
        mode='payment',
        success_url=url_for('posts.payment_success', _external=True) + '?session_id={CHECKOUT_SESSION_ID}',
        cancel_url=url_for('posts.paynow', _external=True),
    )
    return {
    'checkout_session_id': session['id'], 
    'checkout_public_key': current_app.config['STRIPE_PUBLIC_KEY']
    }

@posts.route('/stripe_webhook', methods=['POST'])
@login_required
def stripe_webhook():
    print('WEBHOOK CALLED')

    if request.content_length > 1024 * 1024:
        print('REQUEST TOO BIG')
        abort(400)
    payload = request.get_data()
    sig_header = request.environ.get('HTTP_STRIPE_SIGNATURE')
    endpoint_secret = 'whsec_*************************************'
    event = None

    try:
        event = stripe.Webhook.construct_event(
            payload, sig_header, endpoint_secret
        )
    except ValueError as e:
        # Invalid payload
        print('INVALID PAYLOAD')
        return {}, 400
    except stripe.error.SignatureVerificationError as e:
        # Invalid signature
        print('INVALID SIGNATURE')
        return {}, 400

    # Handle the checkout.session.completed event
    if event['type'] == 'checkout.session.completed':
        session = event['data']['object']
        print(session)
        line_items = stripe.checkout.Session.list_line_items(session['id'], limit=1)
        print(line_items['data'][0]['description'])
        # save to database if successful
        save_order = Order(trans_id = "pppppppppp")
        db.session.add(save_order)
        db.session.commit()

    return {}

@posts.route('/payment_success')
@login_required
def payment_success():
    cart=Cart.query.filter_by(username = current_user.username).all()
    cart.status = "paid"
    db.session.commit()
    return render_template('payment_success.html')