1. A method comprising: receiving, at a computer system, using an interface for accessing a plurality of storage systems, a data request for credential information from a single sign-on service of one or more single sign-on services, wherein the credential information is stored at one of the plurality of storage systems, and wherein the data request includes one or more criteria for obtaining the credential information from the single sign-on service; identifying, using one or more credential criteria identified in the data request based on the one or more criteria, a storage system associated with the data request, wherein the one or more credential criteria are generated for the credential information; selecting, from a plurality of plug-ins, a plug-in corresponding to the identified storage system, wherein the plug-in is selected based on a type of storage system, and wherein the plug-in converts the data request according to the type of storage system; and sending, to the single sign-on service for which the data request is received, data associated with the data request, the data being obtained from the identified storage system.