If the devices that are not eligible for the Samsung Pay will be getting the mini version of the Samsung Pay, which was introduced back in 2017 for the low-end models. As per the user reports in the Samsung community forums, the Samsung Pay is recently available for the Galaxy M12 and the Galaxy A12s. Interestingly, both smartphones got the Samsung Pay with the latest Android 11 update.
In the future, Samsung Pay will be available to more Galaxy devices. Below is the official list of devices that are eligible for Samsung Pay. Interestingly, Samsung has made Pay available for the 2016 Galaxy devices also.