<p>Registers a consumer with a Kinesis data stream. When you use this operation, the consumer you register can then call <a>SubscribeToShard</a> to receive data from the stream using enhanced fan-out, at a rate of up to 2 MiB per second for every shard you subscribe to. This rate is unaffected by the total number of consumers that read from the same stream.</p> <p>You can register up to 20 consumers per stream. A given consumer can only be registered with one stream at a time.</p> <p>For an example of how to use this operations, see <a href="/streams/latest/dev/building-enhanced-consumers-api.html">Enhanced Fan-Out Using the Kinesis Data Streams API</a>.</p> <p>The use of this operation has a limit of five transactions per second per account. Also, only 5 consumers can be created simultaneously. In other words, you cannot have more than 5 consumers in a <code>CREATING</code> status at the same time. Registering a 6th consumer while there are 5 in a <code>CREATING</code> status results in a <code>LimitExceededException</code>.</p>

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

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