What is the difference between API Key, Publishable Key, Signing Secret?

Among the many items required for integrating Bolt with a store front there are three important components used to insure security.

These three components are:

• API Key — This is used for calling the Bolt API from your backend server.
• Publishable Key — This is embedded on your website and used by Bolt JavaScript.
• Signing Secret — This is used for signature verification.