async def get(self,request_configuration: Optional[RequestConfiguration[CustomWorkflowExtensionsRequestBuilderGetQueryParameters]] = None) -> Optional[CustomCalloutExtensionCollectionResponse]:
        """
        Get a list of the accessPackageAssignmentRequestWorkflowExtension and accessPackageAssignmentWorkflowExtension objects and their properties. The resulting list includes all the customAccessPackageWorkflowExtension objects for the catalog that the caller has access to read. Each object includes an @odata.type property that indicates whether the object is an  accessPackageAssignmentRequestWorkflowExtension or an accessPackageAssignmentWorkflowExtension.
        param request_configuration: Configuration for the request such as headers, query parameters, and middleware options.
        Returns: Optional[CustomCalloutExtensionCollectionResponse]
        Find more info here: https://learn.microsoft.com/graph/api/accesspackagecatalog-list-accesspackagecustomworkflowextensions?view=graph-rest-1.0
        """
        request_info = self.to_get_request_information(
            request_configuration
        )
        from ......models.o_data_errors.o_data_error import ODataError

        error_mapping: dict[str, type[ParsableFactory]] = {
            "XXX": ODataError,
        }
        if not self.request_adapter:
            raise Exception("Http core is null") 
        from ......models.custom_callout_extension_collection_response import CustomCalloutExtensionCollectionResponse

        return await self.request_adapter.send_async(request_info, CustomCalloutExtensionCollectionResponse, error_mapping)

        Get a list of the accessPackageAssignmentRequestWorkflowExtension and accessPackageAssignmentWorkflowExtension objects and their properties. The resulting list includes all the customAccessPackageWorkflowExtension objects for the catalog that the caller has access to read. Each object includes an @odata.type property that indicates whether the object is an  accessPackageAssignmentRequestWorkflowExtension or an accessPackageAssignmentWorkflowExtension.
        param request_configuration: Configuration for the request such as headers, query parameters, and middleware options.
        Returns: Optional[CustomCalloutExtensionCollectionResponse]
        Find more info here: https://learn.microsoft.com/graph/api/accesspackagecatalog-list-accesspackagecustomworkflowextensions?view=graph-rest-1.0
        
msgraph/generated/identity_governance/entitlement_management/catalogs/item/custom_workflow_extensions/custom_workflow_extensions_request_builder.py