Contact person: Remove discount code after first purchase shopify due to multiply codes being used

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Location: Leicester, United Kingdom

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I need a concise Shopify solution that stops every discount code from being accepted once a customer has completed their first order and is logged in with the same account. The idea is simple: new shoppers can enjoy any promo code during their initial checkout, but the moment that first purchase records against their account, all subsequent attempts to apply a discount—no matter which code—should be blocked automatically.

The store already tracks customers through account creation, so that is the flag to reference. I am open to whatever approach is most reliable on Shopify Plus or standard Shopify⁠—whether a Liquid snippet, Shopify Functions, Scripts, or a lightweight app you build and hand off. What matters is that:

• The logic checks the customer’s order history (via their account) in real-time at checkout.
• If the account shows zero orders, codes remain valid; otherwise the discount field is disabled or any code entered is rejected with a friendly message.
• The current checkout flow, theme styling, and other apps stay unaffected.

Please test in a development theme or draft order environment first, then guide me through installation and a quick live test so we can confirm the restriction works across web and mobile checkout. A short note on how to enable, disable, or edit the rule later will wrap things up." (client-provided description)