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You can install patches, revoke patches, or just get a patch status. Note, if you are patching the UI or WS for example, you do not need to patch the API for the UI/WS, you just need to run the patcher for the UI or WS. It will apply and manage the API patches as well.
Patches for a release are listed on the release notes page for that release. e.g. v2.2 release notes
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