If you talk to any HTTP API these days, you probably use a proper API client library (of which Pinboard has plenty) rather than manually crafting HTTP requests

If you talk to any HTTP API these days, you probably use a proper API client library (of which Pinboard has plenty) rather than manually crafting HTTP requests with curl. If so, it doesn't matter whether the API supports $popularAuthMethod or not. You just pass the token to the client library and let the client library handle it from there.