A browser application of a mobile device receives an instruction from a web page to obtain identity and/or age data from a digital wallet application of the mobile device, obtains the requested data upon successful biometric authentication, transmits the requested data to the server system, receives a graphic barcode from the server system corresponding to a determination by the server system that the requested data satisfies an identity or age-based restriction or regulation, and causes the graphic barcode to be displayed on a display of the mobile device. A verifying device scans the graphic barcode and transmits it to the server system. The server system transmits a validation decision to the verifying device based on a determination that the graphic barcode transmitted to the mobile device corresponds to the graphic barcode received from the verifying device.