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July 20, 2019 at 1:53 pm #94299
Hi again, TJ,
I was going to add a filter as requested, however, I’ve realized that we can already do that with WooCommerce
woocommerce_after_checkout_validation filter. Please check the “Developers” tab on the plugin page – I’ve just added an example for input fields extra validation there.
Let me know if you have any questions.