Turn on a cart progress bar

Quick Widgets is not on the App Store.

Steps

Open the app and look at the page that lists every widget.
Turn on the cart progress bar. Leave the others off until you need them.
Set the amount the shopper needs to reach, and the message. You can use the amount still needed in that message.
Add the bar in the theme editor.
Add a product under the goal and confirm the message shows the gap. Add enough to pass the goal and confirm the message changes.
If you also use a service charge, and the product is out of stock, the theme editor warns you. Do not offer that service on a product you cannot sell.
A custom field at checkout is an order note. Do not ask for personal details in it.