As soon as I add a restriction by billing address to a payment gateway that payment gateway will never appear, regardless of which country is chosen for the billing address. Example restriction I tried:
I don't understand how it's expected to update the billing address options unless the billing address was taken before the payment methods were shown (i.e. #3035976: Keep billing information as a separate pane instead of replacing it with the payment information pane → ). Switching country does perform an AJAX request, but it doesn't update anything other than the address fields.
As soon as I remove the country restriction, the payment method appears.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
There are tangible business reasons why this is necessary.
In Commerce 1 on Drupal 7 it is possible to limit one payment method so it can only be used in one country, and other payment methods so they can be used in all countries except for that one. We've done that for years on a non-profit org's site and it works reliably.
What is the recommended way of implementing this business rule in Commerce 2, if not via this scenario?