After setting up a Flow in Shopify to tag payment methods as order tags, you can also apply it to past orders by selecting past orders and running the Flow all at once.

After setting up a Flow (https://store-dojo.com/products/2024-08-10) that tags Shopify order information with payment methods other than Shopify Payments, if you want to tag past order information as well, you can run the Flow all at once. (The Flow triggered by Order created can be conveniently run in bulk later.)