Woocommerce-在结帐中获取自定义字段的价值

我有一个灵活的问题，我没有得到任何答案。我在Woocommerce Checkout字段中使用 Checkout Field Editor添加了一个自定义字段。

I have a nimble question that i am not getting any answer of. I have added a custom field using "Checkout Field Editor" in Woocommerce Checkout fields. The field is given below and seems to be working fine.

 <input class="input-text " name="wc_order_field_7542" id="wc_order_field_7542" placeholder="Pickup Date" value="" type="text">

但是，现在我正在开发一个插件，想要在此特定字段中输入值，并且不能似乎能弄清楚。对于其他字段，我只是在执行以下操作，就像我在计费电子邮件中一样，它正在工作：

However, now I am working on a plugin and want to get value inputted in this specific field and cannot seem to figure out. For the other fields I am simply doing the following as I am doing for "billing email" and it is working:

public function get_billing_email() {
        $billing_email = $this->order->billing_email;
        return apply_filters( 'xc_woo_cloud_print_billing_email', $billing_email, $this );
    }
public function billing_email() {
    echo $this->get_billing_email();
}

我确定我会忘记某些事情，而没有做正确的事情。

I am sure I am forgetting something and not doing something right.

感谢您的帮助。