Scenario: Restricted access to MongoDB version of the document database under North China 2 (Beijing) and East China 2 (Shanghai).
Policy example:

{ 
  "Statement": [ 
    { 
      "Effect": "Allow", 
      "Action": [ 
        "mongodb:*" 
      ], 
      "Resource": [ 
        "*" 
      ], 
      "Condition": { 
        "StringEquals": { 
          "volc:RequestedRegion":["cn-beijing","cn-shanghai"] 
        } 
      } 
    } 
  ] 
}

For details of the condition key, please refer to the Condition Use Instructions