Abstract: System(s), method(s), and device(s) that generate and use single-use financial account card numbers (SUFACNs) to facilitate secure processing of financial transactions are presented. A user registers a financial account(s) with a financial transaction platform (FTP), a user profile comprising user-related information is created, and a personal identification number (PIN) is associated with the user. When making a purchase locally or online, the user's portable communication device (PCD) accesses the FTP via an application or web site, the PCD synchronizes with the FTP, and the PCD and FTP each respectively generate the same SUFACN(s) based in part on time of generation and PIN. The SUFACN is presented to the seller's register component via scanning (e.g., when SUFACN is a barcode) or entering the SUFACN. The register component sends the SUFACN to the FTP, which interacts with the user's financial account(s) to facilitate payment.