def METHOD_NAME(certificate_id: Optional[pulumi.Input[str]] = None,
                                             gateway_id: Optional[pulumi.Input[str]] = None,
                                             resource_group_name: Optional[pulumi.Input[str]] = None,
                                             service_name: Optional[pulumi.Input[str]] = None,
                                             opts: Optional[pulumi.InvokeOptions] = None) -> pulumi.Output[GetGatewayCertificateAuthorityResult]:
    """
    Get assigned Gateway Certificate Authority details.
    :param str certificate_id: Identifier of the certificate entity. Must be unique in the current API Management service instance.
    :param str gateway_id: Gateway entity identifier. Must be unique in the current API Management service instance. Must not have value 'managed'
    :param str resource_group_name: The name of the resource group. The name is case insensitive.
    :param str service_name: The name of the API Management service.
    """
    ...