Secure PDF - "It is asking me to login when I submit a payment"
I am being asked to login when I try to submit a payment. What should I do? Explanation
It gives you this kind of pop-up?

This is not the PDF Password / challenge problem. Some companies have a proxy server that your computer is directed through before you can connect to the internet. You probably have to authenticate yourself on the proxy server before being allowed to connect the internet.
Solution
You should enter the same username & password as you would normally when browsing the internet,
