Mailchimp

1. Core concepts

   Core Mailchimp concepts of audiences, contacts and campaigns.

2. API concepts

   Marketing API structure, resources and request conventions.

3. Authentication and first request

   Authenticating with API keys or OAuth 2.

4. Audiences and contacts

   Audiences (lists) and managing members.

5. Campaigns

   Creating, scheduling and sending campaigns.

6. Webhooks

   Audience webhooks for subscriber events.

7. Batch operations

   Batch operations for running many calls asynchronously.

8. Transactional

   Transactional email fundamentals (Mandrill) such as sending, tags and webhooks.

9. Transactional quick start

   Quick start for sending a first transactional message.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.