Hello Intrepidity,
the swagger docs for the login are here
https://api.macau.exbet.io/apidocs/#/user/post_v2_login.
Looking at your link, you have a `post/` too much in the URL, and the payload must be a valid json dictionary.
From the console, you can get your token via
curl -X POST "https://api.macau.exbet.io/v2/login" \
-H "accept: application/json" \
-H "Content-Type: application/json" \
-d "{ \"password\": \"yourpassword\", \"username\": \"yourusername\"}"
Please try and let us know if you have any more toubles!