This Trackmania 2020 plugin allows you to export various stats to an api of your choice for later processing. One example for this is https://tmc.risyn.art

The only thing your API needs to do is return a status code coresponding to the success of the request (e.g. 200 if everything worked, 500 if something went wrong server side, etc.)

More details (e.g. data format, etc.) on Github.