Help Center/ Simple Message Notification/ FAQs/ What Are the Requirements for an SMN Topic Name?
Updated on 2025-04-02 GMT+08:00
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What Are the Requirements for an SMN Topic Name?

  • A topic name can up to 255 characters, including letters, digits, hyphens (-), and underscores (_).
  • Each topic name in an account must be unique.
  • The topic name is the unique identifier of the topic, and it cannot be modified once created. SMN assigns a unique URN to the topic, including the service name (SMN), region name, project ID, and topic name. When you call an API to create a topic, a topic URN will be returned. The topic URN will be used whenever a publisher or subscriber performs operations relating to the topic.