Display order custom field value in complete order

Hi,

Most payment plugins don't have a thank you page and use HikaShop's default thank you page. In that case, it's indeed the checkout / after_end view file which is used and you can edit it via the menu Display>Views.
There, you'll find this line of code:

which displays the message "Thank you for your purchase." at the end of the checkout.
To do what you want supposing your payment plugin is using the default thank you page, you need to change that line to:where xxx is to be replaced with the column name of the custom order field you created.
Then, in your translation overrides, you can change the translation key THANK_YOU_FOR_PURCHASE from:
THANK_YOU_FOR_PURCHASE="Thank you for your purchase."
to:
THANK_YOU_FOR_PURCHASE="Your order is now complete. The item will delivered to you on %s."

However, since you have the text "Your order is now complete." it means your payment plugin don't use the default thank you page and it has its own thank you page.
For example, suppose you're using the "bank transfer" payment plugin. It means you're using the file plugins/hikashoppayment/banktransfer/banktransfer_end.php
To make an override of that file, you need to copy it to templates/YOUR_TEMPLATE/hikashoppayment/banktransfer_end.php via FTP.
In that copy, you can change the line:in a similar fashion to:where xxx is to be replaced with the column name of the custom order field you created.
Then, in your translation overrides, you can change the translation key ORDER_IS_COMPLETE from:
ORDER_IS_COMPLETE="Your order is now complete."
to:
ORDER_IS_COMPLETE="Your order is now complete. The item will delivered to you on %s."