Ключевые слова: authentication, barcode, black smartphone, code scanning, connectivity, cryptography, data exchange, device, digital access, digital code, digital identification, digital pattern, digital wallet, ecommerce, geometric background, hand, handheld, information, mobile app, mobile payment, mobile screen, modern technology, online access, pattern backdrop, qr code, scan, secure link, security, simplicity, smartphone, tech, tech in hand, tech savvy, technology, touch screen, transaction, user interaction, userfriendly, wireless,