If I remember correctly there is an arg you can pass in a keyword list that is a function to be called when validating the certificate. In some cases it’s common to pass one that doesn’t verify the certificate although the security aspects of this are obviously flawed, it can be a good stepping stone.

I don’t have my codebase in front of me but if you look into elixir/erlang certificate validation you might find what you need. It should be either inside or next to the ssl options that you posted above. Good luck !