# Working with other services

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This page was generated from content adapted from the [AWS Developer Guide](https://github.com/awsdocs/aws-step-functions-developer-guide.git)
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## AWS SDK service integrations

* **Note**\
  The API action will always be camel case, and parameter names will be Pascal case. For example, you could use Step Functions' `startSyncExecution` API action and specify the parameter `StateMachineArn`.
* **Note**\
  Amazon OpenSearch Service is the successor of the Amazon Elasticsearch service, and we recommend that you use OpenSearch Service for your service integrations.

## Service Integration Patterns

* **Note**\
  Service integrations that use the `.sync` pattern require additional IAM permissions. For more information, see [IAM Policies for integrated services](https://github.com/kevinslin/aws-reference-notes/blob/main/services/aws_step_functions/service-integration-iam-templates.md).
* **Note**\
  A task token must contain at least one character, and cannot exceed 1024 characters.
* **Note**\
  You must pass task tokens from principals within the same AWS account. The tokens won't work if you send them from principals in a different AWS account.
* **Note**\
  To avoid waiting indefinitely if a process fails to send the task token with `SendTaskSuccess` or `SendTaskFailure`, see [Configure a Heartbeat Timeout for a Waiting Task](#wait-token-hearbeat).

## Code Snippets

* **Note**\
  For more information about specifying service parameters, see [Pass Parameters to a Service API](https://github.com/kevinslin/aws-reference-notes/blob/main/services/aws_step_functions/connect-parameters.md).