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1. Tutorial: WooCommerce Checkout: Ad... Tutorial: WooCommerce Checkout: Add multiple custom fields to billing area. This code adds priority placement of field. Shows the custom fields in the backend Order Details screen and in e-mails to the admin and customer. I have also adjusted the checkbox field to give a text result instead of a value of 1. Checkbox is also pre-selected.

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   /* --------- Adds custom fields using filters. ------ 

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   The below custom fields shows various types one can use.

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   It is then displayed in the backend Order Details page and in admin and customer e-mails.

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   Checkboxes by default result only show the number 1 when clicked. I have added code so that when the a checkbox is clicked it will

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   show text such as On and Yes. Checkbox is also pre-selected.