How does one setup an AAM destination for Pinterest?
The only option for a Pinterest destination for AAM is using a URL-based Destination. Details can be found on this Experience League Community page. While not officially supported by Adobe, URL destinations in general are.
Note that the article mentions the possibility of a server-to-server integration (S2S) or a cookie-based destination. Neither of those options were viable when this article was written. There is also no active development of an AAM and Pinterest integration. Customer’s are encouraged to use a custom, URL destination as described earlier.