Abstract: A computer-implemented method is disclosed. The method includes: authenticating a user for login to a service for a first authenticated user session; in response to authenticating the user, sending, to a client device associated with the user, a first data string associated with a first validity period; receiving, from the client device after expiry of the first authenticated user session, a data access request to access protected data, the data access request including the first data string; validating the first data string based on checking the first validity period; and in response to determining that the first data string is valid, transmitting, to the client device, a data access response including at least a subset of the requested protected data.

Abstract: A computer-implemented method is disclosed. The method includes: authenticating a user for login to a service for a first authenticated user session; in response to authenticating the user, generating a first data string associated with a first validity period; sending, to a client device associated with the user, the first data string; receiving, from the client device, a data access request to access a first data set at a remote data source, the data access request including the first data string; determining that the first authenticated user session has been terminated at a time of receiving the data access request; validating the first data string based on checking the first validity period; and in response to determining that the first authenticated user session has been terminated and that the first data string is valid, transmitting, to the client device, a data access response including at least a subset of the first data set.

Abstract: A method for real-time processing of data retrieval requests is disclosed. The method includes: receiving, from a client device, a first login request to log in to a service; authenticating the user for login to the service; in response to authenticating the user, generating a first data string representing at least a unique device identifier for the client device and a validity period; storing the device identifier; sending, to the client device, the first data string; receiving, from the client device, a data retrieval request to retrieve a data set from a remote server, the data retrieval request including the first data string; determining whether the first data string is valid based on checking the validity period; in response to determining that the first data string is valid: obtaining the data set from the remote server; and sending, to the client device, first data based on the obtained data set.