API Overview

By calling SMN APIs, you can use all functions provided by SMN, for example, creating a topic and adding a subscription.

**Table 1** API description
Category	Description
Topic operations	Create, modify, and delete topics.
Subscription operations	Query the subscription list, add and delete subscriptions.
Template operations	Create, modify, and delete message templates.
Message publishing	Publish messages in the different formats, including text, JSON, and message template.
Resource tag operations	Query resources by tag, add resource tags, and query tags.
Version querying	Query SMN API versions and information about the SMN API v2 version.