Block Amazon "Buy for Me" Before Shopify Checkout

If you’re reading this, you’ve probably already seen a few Buy For Me orders come through. They look legitimate at first, then create friction you didn’t sign up for.

The fastest way to deal with that isn’t manual review or cleanup. It’s stopping those orders from being created at all.

Here is the clean way to do it, using Shopify’s own tooling.

Why checkout validation is the best solution

Once a Buy For Me order exists, you’re already doing extra work. You’re reviewing it, deciding what to do, and usually unwinding it.

Blocking at checkout skips all of that. No order record, no payment, no refund, no follow-up.

The Workflow

We’ll create a checkout validation rule that:

  • Reads the buyer’s email
  • Rejects emails ending in buyforme.amazon
  • Shows a clear error
  • Stops payment entirely

Step 1: Environment setup

Install:

then log in to Shopify:

shopify auth login

Step 2: Create a private app with Functions

We’ll make a custom app for your store only.

Create it:

shopify app init

Choose:

  • “Build an extension-only app”
  • Your organization
  • “Yes, create it as a new app”
  • Enter an app name

Then enter the app directory.

Step 3: Add a checkout validation function

Generate the extension that will run during checkout:

shopify app generate extension

Select:

  • “Cart and checkout validation”
  • Enter a function name
  • “Javascript”

Step 4: Add the code

Now let’s add the email rule code:

Open extensions/FUNCTION_NAME/src/cart_validations_generate_run.js.

Replace the contents with:

export function cartValidationsGenerateRun(input) {
  const errors = [];

  const email = input.cart?.buyerIdentity?.email?.toLowerCase() ?? "";

  if (email.endsWith("buyforme.amazon")) {
    errors.push({
      message: "Orders cannot be placed using Amazon Buy for Me email addresses",
      target: "$.cart.buyerIdentity.email",
    });
  }

  return { operations: 
    [
      {
        validationAdd: {
          errors
        },
      },
    ] };
};

Step 5: Deploy and enable

Deploy the app:

shopify app deploy

Then enable it in admin at Settings → Checkout → Checkout rules

Once enabled, it’s live immediately.

That Amazon Buy for Me orders will now be blocked during checkout.

Heads Up

Proxy orders are only one tactic Amazon uses to screw you.

They also run aggressive product scraping bots. These bots harvest pricing, availability, and metadata continuously. Your data is used against you for Amazon’s benefit.

FraudFighter blocks both of these tactics. Not with alerts or dashboards, but by stopping the behavior outright.

FraudFighter gives you ongoing protection. We actively monitor Amazon’s actions so we can stop their next hostile scheme too.

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