Since the API is currently in BETA (v0.3) there is not yet a backend website where you can configure your account and access keys to the API.
If you want to access the API, please sign up at Beta Signup
We will get back to you with an API key that you can use to access the API.
Since the API is in BETA (v0.3) access is free.
All beta users will get a lifetime 50% discount on all future pricing.