I am in Australia. I have done a bit of research and so far my only option is the Westpac paywear chip (maybe someone knows of an alternative) Wearables - Westpac PayWear Wearable Payment Device | Westpac the link doesn’t tell you much about the chip itself, but it is listed on the payment conversion store page.
The main thing holding me back from getting this done is the size of the implant looks intimidating and deciding where to put it…