HubSpot

1. Developer Platform Overview

   HubSpot developer platform concepts, apps, and tooling.

2. Account Types

   Standard, developer, and test accounts.

3. Understanding the CRM APIs

   CRM objects, records, properties, and associations.

4. Using Object APIs

   Creating, reading, updating, and batching records.

5. Properties API

   Default and custom properties and property groups.

6. Associations

   Associating records, labels, and association limits.

7. CRM Search

   Filtering, sorting, and searching across CRM object types.

8. Pipelines

   Deal and ticket pipelines and stages.

9. Imports and Lists

   Bulk importing records and managing segments.

10. OAuth and Scopes

    OAuth flow, access and refresh tokens, and scopes.

11. Webhooks

    Webhook subscriptions and delivery.

12. Validating Requests

    Verifying that requests come from HubSpot.

13. API Usage Guidelines and Limits

    Rate limits, daily limits, and batch recommendations.

14. Platform and API Versioning

    Dated API versions and their lifecycle.

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