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Flexible, RESTful access to the user's inbox

The Google Analytics API v3 offers programmatic access to retrieve and manage Google Analytics reporting data—including standard, multi‑channel funnel, and real‑time metrics—as well as administration of accounts, properties, and profiles.

Allows you to programmatically access and Smartsheet data and account information

The Square Connect API is a REST‑based client library that enables developers to integrate Square services such as payment processing, refunds, and mobile card‑reader authorization. It also provides endpoints for OAuth token management and for creating, retrieving, and updating employee and role information within a Square account.

A REST API that lets developers programmatically access and manage Trello resources such as boards, lists, cards, actions, members, organizations, and related entities.