Deleting or editing order information from the Shopify admin screen will not be reflected in the order history on your My Page.

If you delete or edit order information from the Shopify admin screen, you will not be able to obtain the line_item.id using "refund.refund_line_items" etc., and the order will not be reflected in your order history on your My Page.

When I delete an item or adjust the quantity on the Shopify admin page, it doesn't reflect on the user page > order history screen.

Shopify Community Japan (JP) Shopify Discussion Technical Q&A/cite>