Hello @michael_tsikerd ,
There is not a "default token" for Canvas that you can use. In general, you need to store the tokens somewhere outside files you are posting to the repository. This can be in an environment variable, or in a configuration file stored in the user's profile. I personally prefer the second approach because you can have your app look for the configuration file and, if it doesn't exist, prompt the user to enter their token and then write the configuration file for them.
As long as you make sure the configuration file is ignored when you push to the repo, you should be all set.