# CallbackStepMetadata
<a name="API_CallbackStepMetadata"></a>

Metadata about a callback step.

## Contents
<a name="API_CallbackStepMetadata_Contents"></a>

 ** CallbackToken **   <a name="sagemaker-Type-CallbackStepMetadata-CallbackToken"></a>
The pipeline generated token from the Amazon SQS queue.  
Type: String  
Length Constraints: Fixed length of 10.  
Pattern: `[a-zA-Z0-9]+`   
Required: No

 ** OutputParameters **   <a name="sagemaker-Type-CallbackStepMetadata-OutputParameters"></a>
A list of the output parameters of the callback step.  
Type: Array of [OutputParameter](API_OutputParameter.md) objects  
Array Members: Minimum number of 0 items. Maximum number of 50 items.  
Required: No

 ** SqsQueueUrl **   <a name="sagemaker-Type-CallbackStepMetadata-SqsQueueUrl"></a>
The URL of the Amazon Simple Queue Service (Amazon SQS) queue used by the callback step.  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 256.  
Required: No

## See Also
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For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/sagemaker-2017-07-24/CallbackStepMetadata) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/sagemaker-2017-07-24/CallbackStepMetadata) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/sagemaker-2017-07-24/CallbackStepMetadata)