Area of interest

I would suggest you check sentinelhub-py library, which makes these kind of requests easy to do:
https://sentinelhub-py.readthedocs.io/en/latest/examples/sentinelhub_request.html

I am not sure of what you mean by “ligne size”
Sentinel Hub processes data on the pixel basis so you cannot define things on the “line level”.

Thanks, the subject seems not to be addressed in those requests. And yes, if lines are pixel-based the size (“thickness”) can not be altered.