Computing platforms, methods, and storage media for processing a data request are disclosed. Exemplary implementations may: receive a data transfer request including data transfer instructions associated with the data transfer; obtain an aggregator access profile specifying application programming interface (API) access to be granted to a data aggregator with respect to one or more APIs; obtain a user account authorization token specifying access to be granted to the data aggregator with respect to one or more user accounts; determine access permissions associated with the data transfer instructions based on a combination of the aggregator access profile and the user account authorization token; and transmit an access notification based on the determined access permissions, the access notification specifying the combination of the one or more APIs and the one or more user accounts to which the data aggregator is granted access. Application-specific account permissions and data type permissions may be specified.