Пользовательское поле на странице оформления заказа woocommerce не работает [дубликат] ⇐ Php

[Anonymous]

Я пытаюсь добавить несколько полей настройки на страницу оформления заказа woocommerce. Пытаюсь следовать образцу кода документации woocommerce, а также другим кодам, доступным в Интернете, но ни один из них не сработал. Чтобы избежать конфликта тем или плагинов, я также попробовал код в новой установке WordPress на локальном хосте. Но никакого ответа. Мне нужно заполнить настраиваемые поля в зависимости от количества продуктов, выбранных на странице корзины, поэтому я предпочитаю решение с помощью кода, а не любого плагина для настройки поля.
Код, который я пытаюсь добавить для настройки на странице оформления заказа woocommerce указано следующее:
``
Документация Woocommerce, которую я пытаюсь:
https://developer.woocommerce .com/docs/customizing-checkout-fields-using-actions-and-filters/
Ссылка на мой сайт:
https://nin-london.uk/product/ nin-card/
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