Big Book vs External Accounts API
If you need a Books API that's easy to integrate, go with Big Book.
Big Book
The Big Book API allows you to semantically search, filter, sort, and recommend books
External Accounts API
The External Accounts API is used to manage accounts for Viber Business Messages, Facebook Messenger and Whatsapp for use in the [Messages](https://developer.nexmo.com/messages/overview) and [Dispa...
Big Book
- Simple API key authentication
- HTTPS supported
- CORS enabled for frontend use
External Accounts API
- Simple API key authentication
- HTTPS supported
| Feature | Big Book | External Accounts API |
|---|---|---|
| Authentication | apiKey | apiKey |
| HTTPS | Yes | Yes |
| CORS | Yes | Unknown |
When to use which?
Big Book works directly from the browser with CORS enabled, making it better for frontend-only apps.