Get Properties from the API

[azerty9971]

Hello,
I have a Smoke Alarm that sends most of its sensor values through the /pen channel in MQTT.
The thing is that it sends messages using the dpId and so in order to be able to convert this into a regular state in the Tuya integration for Home Assistant I need to have a way to retrieve the dpId information (same thing as the "Query properties" in IOT Core in Tuya Cloud API):

Could you give me an API endpoint that I can call to get such information?
Also, is there a documentation for the available API used by this SDK? I couldn't find any by myself...

Thanks in advance,
Azerty