Hi,
There is no payment plugin which directly integrates with the Apple Pay API.
However, there are payment service providers which supports it and for which there is a plugin available.
This depends on your region, and the payment service provider API and how the plugin is made.
So I can't say for sure.
First thing would be to search here
developer.apple.com/apple-pay/payment-platforms/
in the payment service provider for your country as merchant so that you get a list of the PSPs supporting Apple Pay.
Then you need to check the payment gateways on how they support apple pay and what API is supported by the payment plugin available for the payment gateway.
For example, for the USA, you have "authorize.net" listed. But checking there, it seems that it is only the Accept Mobile SDK which supports Apple Pay, and thus only for apps on smartphones, not for ecommerce websites and not the SIM or AIM APIs integrated in the authorize.net plugin available by default in HikaShop.
Now I can't check all of them for you as the list is quite long so I can't provide a precise answer. On top of that, most payment plugins are not developed by us but by third party developers so I wouldn't even be able to say. For example, for Braintree, which is also listed as supporting Apple Pay, nothing is written about it on the plugin's page created by our partner so I can't say for sure. You would have to ask them.