API keys allow apps to make requests to Voice2Phone Call API on the behalf of a user. Each API key is unique to the user, so be sure to keep them secret! Do not share your secret API keys in publicly accessible areas such GitHub, client-side code, and so forth. API keys do not expire, but they may be regenerated by the user. Authentication to the API is performed via HTTP Basic Auth. Provide your API key as the basic auth username value. You do not need to provide a password. All API requests must be made over HTTPS. Calls made over plain HTTP will fail. API requests without authentication will also fail. Your secret API key can be found when you login to your account.