The DQR API swagger documentation can also be accessed inside your XNAT at https://{XNAT_HOME_URL}/xapi/swagger-ui.html. From that UI, you can execute all the API calls.
The DICOM Query Retrieve Plugin API is split up into two sets of controls:
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A set of URIs for managing connected PACS listings, in the namespace /xapi/pacs
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A set of URIs for managing access and executing DQR commands, in the namespace /xapi/dqr
Most of these endpoints, other than those for performing queries and export operations, are restricted to XNAT administrators.