The "Hong Kong Common QR Code" mobile application (HKQR) may be used by payment service providers (PSPs), merchant acquirers or merchants for converting multiple QR codes from different PSPs into a single, combined QR code. Only static QR codes, which conform to the Common QR Code Specification for Retail Payments in Hong Kong (Merchant-Presented Mode), provided by participating PSPs can be combined by the HKQR. Merchants may contact their PSPs and request for QR codes that conform to the Specification. The participating PSP list is subject to change from time to time.