It's actually totally easy. Just let your characters interact with their environment in a natrual way.
Here's a real world example, showing different systems of paying the fare for a public bus:
- Out of breath from running to the bus stop, John was still struggling with the ticket machine when the bus approached around the corner. (Konstanz, Germany) 2. The conductor was blocking the aisle, so Pete sat in the last free seat with a grin while John had to unpack half his rucksack to get at the money for their ticket. (Russia) 3. The bus driver did not want to accept John's 50 Euro bill, claiming he had no change. "Either you have change or you get off," he said in a bored voice. John promised himself never to come to Germany again. (Reutlingen, Germany) 4. John was about to push a coin into the slot of the ticket machine, when the bus suddenly started, throwing him off balance, and the coin rolled away below the seats. (Tübingen, Germany)
All examples explain where and how you pay for your bus ticket (a machine outside the bus at the bus stop; a conductor riding in the bus; the bus driver; a machine inside the bus) in a way that someone living there would tell what happened to him to another local and without breaking the action. Do the same for imaginary environments:
John walked down the hot orange plastic of the street, wondering if his implant had enough credit for the hoverbus.
If, as in your example with the viewing restriction, things are "just there" but don't activate, people still take note of them. For example, Henry, being late to a pre-paid viewing, would think about the potential problem of not being paid for. E.g.:
Henry arrived late to the party, worrying he would interrupt the movie. The payment detector blinked, slowly counting the changed number of viewers, but obviously Bob had paid one extra, because the tv kept showing the movie.
If you can, give the appliance a name, and chose a descriptive one. When you navigate your own world, you constantly notice and name stuff in your head, so let your characters do the same, it will appear normal (see the "hoverbus" example, which tells everything you need to know about public transportation with one word).