Open DACS Permission Server(ODPS) is not an API so it is not suitable to post ODPS questions here. I suggest you submit the questions to ODPS support team directly via My Account, https://my.thomsonreuters.com/ .After you log in, click "RAISE A CASE" then "Product Support". Then, select your subject e.g. “I need help using the product”. At “Select product”, select "DACS - Data Access Control System".
As far as I know, ODPS is one product in DACS family.
If you cannot access My Account, please send email to firstname.lastname@example.org