{
   "AWSTemplateFormatVersion": "2010-09-09",
   "Resources": {
      "MyThingPrincipalAttachment": {
         "Type": "AWS::IoT::ThingPrincipalAttachment",
         "Properties": {
            "ThingName": {
               "Ref": "NameParameter"
            },
            "Principal": "arn:aws:iot:ap-southeast-2:123456789012:cert/a1234567b89c012d3e4fg567hij8k9l01mno1p23q45678901rs234567890t1u2"
         }
      }
   },
   "Parameters": {
      "NameParameter": {
         "Type": "String"
      }
   }
}