Keep the tablet near your point of sale as shown in pictures attached here. Also, take a look at this screencast to find how customers can subscribe to text-based offers from your store.
In either case, customers must acknowledge a text message they receive on their phone to confirm the subscription. They just have to reply to that message with "Y" or "YES". Only after they confirm, they are considered a subscriber. They can unsubscribe at any time by sending STOP message.
Looking for anything specific article which resides in general queries? Just browse the various relevant folders and categories and then you will find the desired article.
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