Getting this to work from postman, or even just the command line, is a good idea. From the screenshot you posted, it looks like you’ve got the api-username and api-key in the body of the request. Those parameters need to be in the request header. The body of the request should contain the sig and sso key/value pairs. If it helps, here’s how the WP Discourse plugin handles it: wp-discourse/lib/plugin-utilities.php at main · discourse/wp-discourse · GitHub .
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