def METHOD_NAME(certificate_name: Optional[pulumi.Input[str]] = None,
                                              resource_group_name: Optional[pulumi.Input[str]] = None,
                                              resource_name: Optional[pulumi.Input[str]] = None,
                                              opts: Optional[pulumi.InvokeOptions] = None) -> pulumi.Output[GetWebPubSubCustomCertificateResult]:
    """
    Get a custom certificate.
    Azure REST API version: 2023-02-01.
    :param str certificate_name: Custom certificate name
    :param str resource_group_name: The name of the resource group that contains the resource. You can obtain this value from the Azure Resource Manager API or the portal.
    :param str resource_name: The name of the resource.
    """
    ...