python from alipay import AliPay alipay = AliPay(app_id='your_app_id', app_private_key_string='your_app_private_key', alipay_public_key_string='alipay_public_key', sign_type='RSA256', debug=True) order_string = alipay.api_alipay_trade_page_pay(subject=subject, out_trade_no=out_trade_no, total_amount=total_amount, return_url=return_url, notify_url=notify_url) pay_url = alipay.gateway + '?' + order_string