Abstract: Systems and methods are provided for updating credentials for accounts associated with users. An example computer-implemented method includes receiving, from a first party, an authentication request for a network transaction associated with an account, the authentication request including a credential unique to the account; determining that the credential unique to the account is invalid; and in response to determining that the credential unique to the account is invalid: identifying an updated credential unique to the account; appending the updated credential unique to the account to an authentication message; and transmitting the authentication message to one of the first party and an access control server (ACS) associated with an issuer of the account.

Abstract: A bifurcated intravascular stent graft comprises primary stent segments and a primary graft sleeve, forming a main fluid channel and having a side opening therethrough. An external graft channel formed on the primary graft sleeve has a first end communicating with the side opening and an open second end outside the primary graft sleeve, thereby providing a branch flow channel from the main channel out through the side opening and external graft channel. The primary stent segments and graft sleeve engage an endoluminal surface of a main vessel and form substantially fluid-tight seals. The stent graft further comprises a secondary stent graft, which may be positioned partially within the external graft channel, through the open second end thereof, and partially within a branch vessel. The secondary stent graft engages the inner surface of the external graft channel and the endoluminal surface of the branch vessel, thereby forming substantially fluid-tight seals.