Line item properties are specified directly on the product page. Order notes, which are available in every free Shopify theme, let you capture special instructions on how to prepare and deliver an order. You can't change the items or the quantities in an order using the REST API, but you can change them using the GraphQL Admin API.. But I found out about cart attributes, I did the instructions provided here: https://help.shopify.com/themes/customization/cart/get-more-information-with-cart-attributes Attributes for money amounts, such as prices and totals, are in the customer's local (presentment) currency. Add fields to the customer registration form Note. Understanding how orders work in Shopify is an important part of running your business. https://help.shopify.com/en/themes/customization/cart/get-more-information-with-cart-attributes.
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