For Xtremepush integrations which require an API "Token" or "Key" to be saved in the corresponding tools settings or setup pages you will need to generate it from the following place in your Xtremepush Project.
Project Settings > Integrations
From the list of possible integrations find the one you want to generate a token for and click the Generate button.
This will generate a token which you can then copy to your clipboard and use where needed.
If at anytime you wish to block the connection to the 3rd party application you can come back to this same page and revoke the token.