How to get certified to develop plug-ins for Safari?

Question

Apple Developer Program

Good afternoon!
On the Internet, trying to find the answer to this question, I came across various articles, but they all lead to the link developer.apple.com/certificates/safari
But Apple redirects it to https://developer.apple.com/account/overview.action, where it is proposed to buy a developer account for IOS, which, I don’t need yet :)
Tell me, how can I get a certificate now?

Answer 1

As far as I remember, not so long ago the rules changed, now there is one general license for everything: iOS, OS X, watchOS, tvOS and Safari. And she's paid.