[struggle]

The coupon was downloaded onto the screen of the phone and shown to the clerk, who scanned the block code. The payment was FeliCa.

[RayChuang88]

That sounds like an older FeliCa payment method, especially since it required the store clerk to use an optical reader to read the block code on the cellphone's display screen. On the newest FeliCa-equipped cellphones in Japan, all you need to do is wave the phone in front of an near-field communications (NFC) reader and the payment is ready to be automatically transacted.

Hong Kong's Octupus payment card system uses the FeliCa format, but last I heard they haven't integrated it with any cellphones sold in Hong Kong.