I currently have Shopify Payments accepting American Express on my store. We use Recharge to take subscription payments with Shopify Payments as processor.
I would like to switch off American Express to new customers - 2.7% fee vs Visa/MC 1.7% processing fee (we're based in UK).
If I switch off American Express on payment settings, will it block my existing subscribers when they get charged for their subscriptions? I do not want to affect my existing subscribers who use Amex to pay for their subscriptions.