Ok, I’ve installed the wp-discourse WP plugin and have it working. I can log into the Discourse instance by logging into the WP site (directed there via the Discourse login button). Only issue: I want to be able to allow people the option of logging in via WP, but not forcing it… (The OAuth2_basic plugin + WP OAuth Server does, in theory, allow that). The HTTPS issue doesn’t seem to be a problem with the wp-discourse plugin.