1. A method to process authenticated user requests to access resources, the method comprising: receiving from a user a request to perform an action on a resource; receiving, by a server, a rule associated with the action, wherein the server comprises a processor and operatively associated memory, and wherein the rule indicates conditions under which a request to perform the action on the resource should be granted; determining a plurality of attributes required to evaluate the rule; classifying at least a portion of the plurality of attributes by connector, wherein each connector is in communication with an associated remote data source comprising values for attributes classified with the connector; for a first portion of the plurality of attributes classified with a first connector: for each of the first portion of the plurality of attributes, determining whether an attribute value for the attribute is present at the server; generating a first connector request, wherein the first connector request comprises each of the first portion of the plurality of attributes that lacks an attribute value at the server; and requesting attribute values for each attribute included in the first connector request, wherein the requesting takes place via the first connector and is directed to the remote data source associated with the first connector; evaluating, by the server, the user request to determine whether the user is authorized to perform the action on the resource, wherein the evaluating comprises applying the rule considering the values for the plurality of attributes; and returning an authorization decision.