You need to connect an SSL I/O handler to the HTTP client. I don’t remember exactly the name of those components. I only remember there is an IOHandler property and you must pass a pointer to a SSL handler component. You’ll need this for all requests.
I edited the code sample on my previous post, try that now. Sorry but this is as far as I will go on this topic. If you have any question about the API feel free to ask, as for the Delphi/HTTP part you need to visit other forums/resources. You could also ask around in the community discord server to see if anyone there have a working Delphi code they can share.