To run, pull from Dockerhub using the tag rb28z2/questrade2mqtt and provide the following environment variables: MQTT_HOST and QUESTRADE_API_KEY. Optionally, you can also provide MQTT_USER (and MQTT_PASS) as well as MQTT_PORT if you want to use a port other than the default 1883. You can also provide REFRESH_INTERVAL with a number to override the default 5 minute refresh interval. FORCE_REFRESH can also be used if you want to force refreshes while the TSX is closed for the day (for things like debugging and after hours trading).
This is the companion/server-side code for a project that displays this information on a small OLED screen powered by a microcontroller. That project is available here: https://github.com/rb28z2/ESP8266-Questrade-Display