It’s not a perfect solution, but Shopify has recently come out with Shopify Functions, which allows you to create your own automatic discounts with custom logic.
So, if you’re wanting to achieve this without an app, I recommend taking a look at the Shopify Functions documentation.
Otherwise, you can check out my app, Regios Automatic Discounts. It makes it super easy to create apply automatic discounts to tagged customers. Here’s a screenshot:
Let me know if you have any questions. Even if you don’t use my app, I can probably still help you in this thread.
