If your theme does not support app blocks, you will need to add the order form fields code directly to your theme files.
Usually, this involves adding the code to the /snippets/product-form.liquid file in your theme:
- From your Shopify admin, go to Online Store > Themes.
- Find the theme that you want to edit, and then click Actions > Edit code.
- Under the Templates header, click into the product-template.liquid file.
- Locate where you would like the Custom fields to appear.
- Paste the following code block:
- Click Save.
If you are not comfortable editing your theme code, feel free to reach out to our customer support team. We are happy to help you get set up.
Express checkout bypasses required fields
If you use required product page fields (personalization, terms checkbox, age verification, file upload), consider disabling dynamic checkout buttons (Apple Pay, Shop Pay, Google Pay) on products where those fields are mandatory. Customers using express checkout skip the product page entirely and go straight to checkout — they never see your required fields, so they can complete a purchase without providing the data you need. This is a platform limitation, not an app bug. In Shopify, you can disable dynamic checkout buttons per product or globally in your theme settings to ensure customers always pass through the product page and complete required fields.
Paid fields require published products
Paid fields (embroidery +$X, gift wrapping +$Y, rush fees) create hidden products behind the scenes. These products must be set to "Active" and available on your Online Store sales channel — they can be "Unlisted" so they don't appear in collections or search, but they must be published. If the paid add-on price doesn't show in the cart or the option doesn't work, this is almost always the cause. Check your Shopify admin: Products → find the generated add-on products → ensure Status is Active and the Online Store sales channel is enabled. This is the #1 setup mistake with paid fields.
Originally from our Help Center