Guide
1
Create a new customization
Create a new customization.

2
Select the Cart Item Details category
Choose Cart Item Details as the customization category.

3
Choose the Add Notes type
Select Add Notes from the available Cart Item Details options to allow customers to add notes for each cart item during checkout.

4
Choose a placement
Select Render After Each Cart Item from the available placement options.

5
Configure conditions
Add one or more conditions to control when the customization is displayed during checkout.

6
Configure note settings
Customize the Link Title, Notes Title, and Notes Key for each cart item.

7
Activate the customization
Change the Status to Active to enable the customization.

8
Set the priority
Configure the Priority (0–100) to determine the execution order when multiple customizations are eligible.

9
Copy the Placement ID
Open the Placement tab and copy the generated Placement ID. You’ll use this in the Shopify Checkout Editor.

10
Save the customization
Click Save to store your configuration.

11
Open the Checkout Editor
Go to your Shopify Settings → Checkout, select your checkout profile, and click Customize.

12
Add the app block
In the Checkout Editor, click Add app block.

Make sure the app block is added to the same checkout placement you selected in Dynamic Checkout Customizer.
13
Configure the app block
Select the Checkout – Edit Cart Items app block, drag it to the desired location, and paste the copied Placement ID.

14
Publish your changes
Click Save in the Checkout Editor to publish the customization. Refresh your checkout page to verify that the Add Notes functionality is live.

Why does it matter?Cart Item Details -> Add Notes customization for adding custom notes can improve AOV by 10%.
