You will need to sign up for a free account at the CallFire Homepage, click on the [Try It Out!] link to create one.
Then click on the "Account" tab of the CallFire toolbar to get your API key. You will need the API key to perform function calls to your CallFire account.
If you need some minutes for testing, give us a call at 877-897-FIRE or email us directly at [support@callfire.com]