The default/native checkout in v1.5.4 already does "double-click prevention" on the checkout_confirmation page (where final payment is usually submitted) ... by using some brief javascript to disable the Submit button after it is clicked.
The default/native checkout in v1.5.4 already does "double-click prevention" on the checkout_confirmation page (where final payment is usually submitted) ... by using some brief javascript to disable the Submit button after it is clicked.
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