<p>Registers an extension with the CloudFormation service. Registering an extension makes it available for use in CloudFormation templates in your Amazon Web Services account, and includes:</p> <ul> <li> <p>Validating the extension schema.</p> </li> <li> <p>Determining which handlers, if any, have been specified for the extension.</p> </li> <li> <p>Making the extension available for use in your account.</p> </li> </ul> <p>For more information about how to develop extensions and ready them for registration, see <a href="https://docs.aws.amazon.com/cloudformation-cli/latest/userguide/resource-types.html">Creating Resource Providers</a> in the <i>CloudFormation CLI User Guide</i>.</p> <p>You can have a maximum of 50 resource extension versions registered at a time. This maximum is per account and per region. Use <a href="AWSCloudFormation/latest/APIReference/API_DeregisterType.html">DeregisterType</a> to deregister specific extension versions if necessary.</p> <p>Once you have initiated a registration request using <code> <a>RegisterType</a> </code>, you can use <code> <a>DescribeTypeRegistration</a> </code> to monitor the progress of the registration request.</p> <p>Once you have registered a private extension in your account and region, use <a href="AWSCloudFormation/latest/APIReference/API_SetTypeConfiguration.html">SetTypeConfiguration</a> to specify configuration properties for the extension. For more information, see <a href="https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/registry-register.html#registry-set-configuration">Configuring extensions at the account level</a> in the <i>CloudFormation User Guide</i>.</p>

{
  "success": true,
  "data": {
    "id": "abc123",
    "created_at": "2025-01-01T00:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters"
  }
}