Another workaround, you create a customer-specific discount and push it with a script: here. Again, it only works if the customers log in before checkout.

If I recall correctly the forms built with Shopify Forms will allow to both create new customers and update existing ones. And tag them: https://apps.shopify.com/shopify-forms

Have you tried 'bundle' apps?: https://apps.shopify.com/search?q=bundle

There's a Marketing Automation that maybe you can use: Welcome new subscribers  You could change the trigger ("Customer created" instead of "Customer subscribed" or similar), but anyway the emails are only sent to subscribed-to-marketing customers, s...

Have you considered AI Chatbots? In theory you can feed them with your product details and let them answer questions from customers

Hi. Is it one prescription per order, or one prescription per customer? If one per customer, you can require customers to login/signup before being able to checkout (there is a setting in Shopify Admin > Checkout for that).During registration you can...

Hi. If you use a Marketing Automation and Shopify Email, it will only send emails to customers that are subscribed to marketing. But you can add a conditional to check the line.items (products in the order) by name, variant, etc. You could have a wor...

I was going to recommend you using order metafields , but it actually depends on a few things:Do you use an invoice app? At this moment I'm not sure apps can render order metafields on invoices.How do you currently handle notes? Metafields might not ...

Bit late perhaps, but the app in my signature, Customer Accounts, has a Loyalty Program plugin supporting multi-language, and Shopify Markets multi-currency