listDomains 
  Returns the list of domains registered in the account. The results may be split into multiple pages. To retrieve subsequent pages, make the call again using the nextPageToken returned by the initial call.
This operation is eventually consistent. The results are best effort and may not exactly reflect recent updates and changes.
Access Control
You can use IAM policies to control this action's access to Amazon SWF resources as follows:
- Use a - Resourceelement with the domain name to limit the action to only specified domains. The element must be set to- arn:aws:swf::AccountID:domain/*, where AccountID is the account ID, with no dashes.
- Use an - Actionelement to allow or deny permission to call this action.
- You cannot use an IAM policy to constrain this action's parameters. 
If the caller doesn't have sufficient permissions to invoke the action, or the parameter values fall outside the specified constraints, the action fails. The associated event attribute's cause parameter is set to OPERATION_NOT_PERMITTED. For details and example IAM policies, see Using IAM to Manage Access to Amazon SWF Workflows in the Amazon SWF Developer Guide.