A token vault is a secure repository for storing payment credentials that are converted into tokens, so original card or bank details are not stored or exposed. In a PCI DSS-compliant environment like Hellgate’s Guardian module, the token vault acts as the secure layer holding network tokens, card or wallet credentials, while enabling services such as recurring billing, tokenisation lifecycle management and authorization optimisation. This approach enhances data security, reduces scope and enables frictionless reuse of credentials across payment methods.