A facility for conveying accrual amounts through an intermediary service is described. The facility permits vendors to each upload unbilled amounts for one or more matters for a client according to vendor-specific matter identifiers. The facility maps the vendor-specific identifiers for the uploaded unbilled amounts to client-specific identifiers. When the facility receives a request from the client to be you unbilled amounts for one or more matters, the facility displays to a client user the unbilled amounts for the requested matters according to the client-specific identifiers associated with the requested matters.