This is incredibly phishy, and I'm frankly disappointed that people would fall for such a thing. FastSpring, or any other payment provider, would not ask you to

This is incredibly phishy, and I'm frankly disappointed that people would fall for such a thing. FastSpring, or any other payment provider, would not ask you to pay $150 for "admin costs" by following a link, otherwise your account gets terminated. They'd take it out of your revenue as a fee, if anything. It's a classic phishing ultimatum. Do not follow the link.