Integrated solution for paypal payment

Paypal payment integration & lt; formname = & quot; kqPay & quot; method = & quot; post & quot; action = & quot; https://www.sandbox.paypal.com/cgi-bin/webscr" paypal payment integration


This is my code. The value in the input label should be okay.
When submitting the request, if the buyer account is not logged on, a logon error page is displayed.
If the buyer account has been logged on, a prompt is displayed, "you applied for the expired version of PayPal. The cause is usually caused by the use of zookeeper. "

------ Solution --------------------
I found the paypal salesman very diligent.