Use the following API to fetch permissions.

Get a List of Permissions

API
/api/permissions
Method
GET
Parameters
None
Response 
{
  "permissions": [
    {
      "permissionNumber":1,
      "name": "",
      "description": "",
      "updateVersion":1
    },
    {
      "permissionNumber":2,
      "name": "",
      "description": "",
      "updateVersion":1
    }
  ]
}