How to reference a shared ssm parameter(ram based) with Cloudformation

Question

Based on the new SSM Advanced Parameter Cross Account Sharing https://aws.amazon.com/about-aws/whats-new/2024/02/aws-systems-manager-parameter-store-cross-account-sharing/ and https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/parameters-section-structure.html#aws-ssm-parameter-types I need to use the RAM ARN of the shared SSM Parameter

As is mentioned in the documentation
 
> For SSM parameters shared by another AWS account, enter the full parameter ARN. For more information about Systems Manager parameters, see Systems Manager Parameter Store and Working with shared parameters in the AWS Systems Manager User Guide.

I couldn't find an example on how to reference it in Cloudformation

I tried

```
AWS::SSM::Parameter::Name
Default:

```

Oleksii Bebych · Answer

> For SSM parameters shared by another AWS account, enter the full parameter ARN.

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/parameters-section-structure.html#aws-ssm-parameter-types

for example:
```
Resources:
  MyEC2Instance:
    Type: 'AWS::EC2::Instance'
    Properties:
      # Other EC2 properties...
      UserData:
        Fn::Base64:
          Fn::Sub: |
            #!/bin/bash
            echo "${MyParameter}"
Parameters:
  MyParameter:
    Description: SSM parameter value
    Type: 'AWS::SSM::Parameter::Value'
    Default: 'arn:aws:ssm:REGION:SOURCE_ACCOUNT_ID:parameter/PARAMETER_NAME'
```

How to reference a shared ssm parameter(ram based) with Cloudformation

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