When do shoppers prefer using QR codes? Empirical evidence from Vietnam

Abstract This research aimed to explore the factors influencing the behavioural intention to use over-the-counter (OTC) QR codes for purchasing products in Vietnamese supermarkets. The study included 996 consumers and employed a questionnaire-based survey method to test the hypotheses using partial least squares structural equation modelling (PLS-SEM). Drawing on the theory of reasoned action (TRA) and signalling theory, the findings identified five key factors that positively affected the intention to use OTC QR codes: perceived usefulness of OTC QR codes (e.g., for payment and traceability), attitude, customer satisfaction, and supply chain transparency. Additionally, the perceived usefulness of OTC QR codes positively impacted attitude and customer satisfaction, while its usefulness for traceability enhanced supply chain transparency. The study also identified the moderating influence of personal innovativeness on the relationship between perceived usefulness of OTC QR codes for payment and attitude and customer satisfaction. Furthermore, the moderating role of electronic Word-of-Mouth (e-Word-of-Mouth) in the relationship between customer satisfaction, attitude, and behavioural intention was discovered. This research contributes to the existing literature by expanding our understanding of the perceived usefulness of OTC QR codes and elucidating the various mechanisms through which their both functionalities could encourage consumer adoption in the context of Vietnamese supermarkets.