Im thinking like an micro chip implanted in our body. This system is not out of the picture because how we discover things every year, it is not impossible that in the future this things may happen and it will boom like btc.
Of course this will be realized. Only this chip will not only be for payment, it will be multi-functional. In the world, the first chips for identification of a person are considered as a priority task for implementation. I think that the payment will be connected to it.
Yes, the appearance of such implants was predicted for a long time. However, this will mean complete and total government control over each person. In general, this is not a good idea and it should meet fierce resistance from sensible people. Such a chip will also show where any person is in a particular part of the planet, which makes what everyone else says. Who wants to get rid of privacy and privacy rights with such a chip? I personally would not want to.