# 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)