You can add a group of fields to your checkout using the Checkout UI extension. This lets you collect information for the entire order, not just for individual products. The Checkout Extension requires the Growth Plan, available only for stores on Shopify Plus.
- From your Shopify admin, go to Settings >Checkout.
- In the Configurations section, click Customize next to the checkout you want to edit.
- At the top menu bar, select the checkout page where you want to add the app.
- Click Add app block.
- Click on the Magical Fields app block.
- Enable Allow app to block checkout.
- Click Save.
After adding the app to your checkout, you can move it to your preferred checkout area.
That’s it. Your custom fields are now part of your checkout.
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