Use the Dashboard
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Go to Dashboard > Applications > APIs and click the name of the API to view.

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Go to the Permissions tab and click the trashcan icon next to the permission you want to remove and confirm.

Use the Management API
Make a PATCH call to the Update Resource Server endpoint that includes all permissions you want to keep and excludes all permissions you want to delete. ReplaceAPI_ID, MGMT_API_ACCESS_TOKEN, PERMISSION_NAME, and PERMISSION_DESC placeholder values with your API ID, Management API , permission name(s), and permission description(s), respectively.