The InternalApi is located at https://internalapi.vitre.io/swagger/index.html
To obtain a JWT you must login with a username and password using this endpoint https://internalapi.vitre.io/swagger/index.html#/Account/post_Account_Login and pass the required parameters in the body.
To use the Swagger UI for a given endpoint, you need to click on the button.
Then, fill the parameters
Then click on the button to make the HTTP request which is the same as using curl to do it
curl -X 'POST' \
'https://internalapi.vitre.io/Account/Login' \
-H 'accept: text/plain' \
-H 'Content-Type: application/json-patch+json' \
-d '{
"userName": "testusername2",
"password": "testpassword2",
"rememberMe": true
}'
You can see the JWT as the value of "token" in the response body above.