Hi Hakim,
Yes, X-Cart REST API allows accessing the data described in modules
.
If the module introduces a new module, you can access it as follows:
https://devs.x-cart.com/rest-api/#building-_path-for-module-models
If the module adds a new property to an existing model, it will be just returned in the response to pulling this model.
Let me know if it makes sense.
Tony