UpCharge Fees is a Shopify app for adding conditional and automatic charges to your store — gift wrap, processing fees, rush charges, deposits, and more.
The two apps work together without any additional setup. Any fee you set up in UpCharge will automatically appear inside the Cartly cart drawer — no additional setup required on either side.
👉 Website: uc-lab.com
👉 On Shopiy App Marketplace: Upcharge Fees & Product Addons
How to set it up
Open the UpCharge Fees app in your Shopify admin.
Create a new fee
Configure your conditions, input type, and pricing.
Save and publish the fee.
That's it! 🎉
No settings to change in Cartly. No mapping required. The integration works automatically as long as both apps are installed and active.
⚠️ Make sure UpCharge app is enabled in the store theme extensions.
Once the fee is live, it will automatically appear inside the Cartly cart drawer as a line item directly under the relevant product.
Customers can interact with it — check, uncheck, or select options — without leaving the cart.