Payment is the one that already affects you and requires no decision beyond choosing a processor that supports it. Contactless is now the default expectation for in person payment in most categories, and a business that cannot accept a tapped phone or card is creating friction at the moment of sale. If your terminal is more than a few years old, this is worth checking.
The marketing uses are more limited than the enthusiasm suggests. A tag in a window or on a table that opens your menu, your review link, or a booking page is genuinely convenient, but it does the same job as a printed code that anybody can scan from a distance without knowing what the tag is. Codes are cheaper, universally understood, and work from across a room. A tap tag wins only where the interaction is deliberately close range and repeated.
Digital business cards that share your details on tap are pleasant and slightly novel. Whether they are better than a code or a link depends more on your audience than on the technology, and the novelty wears off.
The honest summary is that this is a payment technology with some peripheral uses. Make sure you accept contactless payments. Treat the rest as optional, and if you are choosing between printing codes and buying tags, codes will reach more people for less money.
One practical note if you do use tags: they are inexpensive enough to test and they fail in ordinary ways. Metal surfaces interfere with them unless the tag is designed for it, outdoor placement degrades them, and a tag pointing at a static destination has the same problem as a static printed code, which is that the destination cannot be changed later. Use a redirect you control as the target for the same reason you would with a printed code.
If you accept payments in person, verify that your terminal supports the current contactless standards rather than assuming, since older readers accept cards and reject phone wallets. That is an increasingly common failure at the point of sale, and the customer experience is somebody holding a phone at a reader that does nothing while a queue forms. Checking takes one transaction with your own phone.