My rule, and it is a semi-idiotic one, is "i don't impulse buy from independent merchant websites that don't support apple pay at checkout".
I usually email them after, too. "I actually clicked through your instagram ad, looked at some clothes that looked nice, and didn't buy anything because I was on my phone and didn't want to make a new account and add credentials to my password manager. Have you considered adding apple pay support to your shopify account?"
I think it's not an idiotic idea, it's just that your idea of what counts as third-party payment support is a single smaller payment provider located mainly in the United States. I follow a similar policy, but in my case the third-party payment services are Paypal, Stripe, and Coinbase, all of which are reliable and don't require me to give financial data to the seller. Paypal seems to be near-universally supported on small ecommerce sites.
Note that PayPal gives away your email address, and I’m not a fan of that. If a third party wants my email address, they should ask me directly (and I’ll give them a unique one); PayPal shouldn’t distribute my email address for me.
Look, I use three email domains for online accounts, in addition to a unique address for each account — one domain that links to my actual identity (my public-facing, professional domain), one domain that’s somewhat anonymous, and one domain reserved for highly sensitive accounts, e.g. online banking, PayPal, AppleID, etc. And PayPal sharing my email address with third parties breaks the model, making my sensitive domain less secure.
i picked shopify because i know they have an apple pay switch.
i don’t care who processes the payment, i just like being able to buy physical goods without making a new account, and ideally without any more friction than faceID while impulse-buying nonsense while i’m on the toilet :)
I usually email them after, too. "I actually clicked through your instagram ad, looked at some clothes that looked nice, and didn't buy anything because I was on my phone and didn't want to make a new account and add credentials to my password manager. Have you considered adding apple pay support to your shopify account?"
I have no idea if i'm helping or not.