Firstly, generally a really good plugin. Just a couple of issues, which probably have the same root cuase.
I currently use the free version of the plugin with the Square plugin for payment processing.
The apple pay / google pay buttons do not work on the product page. I have disabled them as i don’t really want them on the product pages anyway.
The apply pay / google pay buttons do not work on the cart page. I have therefore had to disable them site wide. It appears that no value is being passed to them on payment initiation so the transaction is failing.
When people pay using credit card the amount asking to be authenticated by the bank authentication screen is always zero (our products all have a base price of zero and the real cost is created with flat fee options). When the transaction goes through though the value is correct. This is causing people to think they haven’t paid and keep contacting us with queries.