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RSQL is a REST query language that allows you to filter resources based on their attributes. The RSQL query is a string that represents a query in a human-readable format. The RSQL query is passed as a query parameter in the URL and is used to filter the resources based on the attributes of the resource. See RSQL queries for Checkout API for example filters to use with the Checkout API. See  for more information on RSQL queries.