# AWS::ACMPCA::Certificate CustomExtension Structure that contains X.509 extension information for a certificate. ## Syntax To declare this entity in your AWS CloudFormation template, use the following syntax: ### JSON <pre> { "<a href="#critical" title="Critical">Critical</a>" : <i>Boolean</i>, "<a href="#objectidentifier" title="ObjectIdentifier">ObjectIdentifier</a>" : <i>String</i>, "<a href="#value" title="Value">Value</a>" : <i>String</i> } </pre> ### YAML <pre> <a href="#critical" title="Critical">Critical</a>: <i>Boolean</i> <a href="#objectidentifier" title="ObjectIdentifier">ObjectIdentifier</a>: <i>String</i> <a href="#value" title="Value">Value</a>: <i>String</i> </pre> ## Properties #### Critical _Required_: No _Type_: Boolean _Update requires_: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt) #### ObjectIdentifier String that contains X.509 ObjectIdentifier information. _Required_: Yes _Type_: String _Update requires_: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt) #### Value _Required_: Yes _Type_: String _Update requires_: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)