What is a secondary card SISTEMA May 18, 2021 20:06 A secondary card is one that operates as an extension of the main card. For all purposes, it carries out transactions representing the principal with the permissions granted by it through BS Online. Related articles How do I activate a secondary card? How can I increase my credit card limit? Transaction limits query What is a LAC? How do I register the reception of files? Comments 0 comments Article is closed for comments.