When I was in Vietnam last year I remember either a website or an app where there was a number of restaurants offering deals such as BOGOF or a free dessert etc etc. The majority of restaurants were in the bigger cities and you had to make the reservation through the website or app.
I feel like it must have a been a card or payment type promotion, maybe citibank or mastercard. Also, it wasn't only Vietnam there were plenty of other countries available although I seem to remember it may have been mostly Asia.
It's probably a long shot due to my lack of info but would anyone have any idea what the program might be?
Mastercard Buy 1 Get 1? Citibank Dining Privileges?