<p>Publishes up to ten messages to the specified topic. This is a batch version of <code>Publish</code>. For FIFO topics, multiple messages within a single batch are published in the order they are sent, and messages are deduplicated within the batch and across batches for 5 minutes.</p> <p>The result of publishing each message is reported individually in the response. Because the batch request can result in a combination of successful and unsuccessful actions, you should check for batch errors even when the call returns an HTTP status code of <code>200</code>.</p> <p>The maximum allowed individual message size and the maximum total payload size (the sum of the individual lengths of all of the batched messages) are both 256 KB (262,144 bytes). </p> <p>Some actions take lists of parameters. These lists are specified using the <code>param.n</code> notation. Values of <code>n</code> are integers starting from 1. For example, a parameter list with two elements looks like this: </p> <p>&amp;AttributeName.1=first</p> <p>&amp;AttributeName.2=second</p> <p>If you send a batch message to a topic, Amazon SNS publishes the batch message to each endpoint that is subscribed to the topic. The format of the batch message depends on the notification protocol for each subscribed endpoint.</p> <p>When a <code>messageId</code> is returned, the batch message is saved and Amazon SNS immediately delivers the message to subscribers.</p>

{
  "success": true,
  "data": {
    "id": "abc123",
    "created_at": "2025-01-01T00:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters"
  }
}