Validation algorithm in checkout field
First of all, you need to learn WordPress Plugin development, especially how to use WordPress Hooks: https://developer.wordpress.org/plugins/hooks/ Then, you need to learn how to implement Woocommerce specific hooks: https://docs.woocommerce.com/document/introduction-to-hooks-actions-and-filters/ Finally, use appropriate Woocommerce hook to filter & validate Personal Identification Number provided by the user according to your algorithm. Since it’s not clear at what … Read more