Plainstack

Terms of service

Last updated: November 10, 2026

These terms apply when you install a Plainstack app in your Shopify store (for now, Plainstack: Volume Discounts, "the app") or use this website. "We" and "us" mean Plainstack; "you" means the store owner who installs the app. By installing or using the app you agree to these terms and to the Shopify Terms of Service, which also apply to every app.

What the app does

The app creates automatic discounts in your Shopify store: quantity breaks and Buy X Get Y offers. Shopify calculates and applies them at checkout. An optional product page block shows offers to shoppers. The app only ever lowers prices; it never adds charges to your customers' orders.

Your responsibilities

  • Check your offers before you turn them on: the products, tiers, amounts, dates and how they combine with your other discounts. You decide the discounts; we apply what you set.
  • Use the app only for lawful promotions in your store, in line with Shopify's terms and the consumer-protection rules where you sell.
  • Don't try to break, overload or reverse-engineer the app, or use it to access data of other stores.

Pricing and billing

  • All charges for the app go through Shopify and appear on your Shopify bill. We never charge you directly and never see your payment details.
  • Our prices never depend on your revenue or your number of orders, and we don't add usage charges.
  • Early access: the app is free while it's in early access. A store that installs the app during early access keeps using it for free, with no offer limit from us, also after paid plans start. We keep this status in your store's record with us, which survives an uninstall and quick reinstall. If you uninstall and Shopify asks us to delete your store's data (48 hours after uninstall), that record is deleted too; if you come back after that, write to us and we'll review your case.
  • When paid plans start, they apply to stores that install after that date. We'll show the price and any trial before you approve anything in Shopify, and you can cancel any time from your Shopify admin or by uninstalling.
  • If we ever change the price of a plan you're on, we'll tell you at least 30 days before the change takes effect.
  • Refunds follow Shopify's billing rules for apps. If you think you were charged by mistake, write to us and we'll help.

Uninstalling

You can uninstall the app at any time from your Shopify admin. Shopify then removes the app's discounts and its product page block, and billing for the app stops. What we delete and when is described in our privacy policy.

Changes to the app and these terms

We improve the app over time and may change or remove features. We won't remove a feature you rely on without notice in the app or by email. If we change these terms in a way that matters to you, we'll update this page and the date at the top, and tell you in the app before the change takes effect. If you don't agree, you can uninstall.

Stopping the app

We may suspend the app for a store that breaks these terms or Shopify's terms, after telling you why when we can. If we ever shut the app down, we'll give you at least 30 days' notice.

No warranty

We work hard to keep the app correct and available, but we provide it "as is". We can't promise it will always be available, free of errors, or that every discount will apply in every situation, for example when Shopify itself has an outage, when another discount takes priority, or when a theme changes the product page.

Limits on our liability

As far as the law allows, we are not responsible for indirect losses, such as lost profits, lost sales or lost data, that come from using or not being able to use the app. If we are responsible for a loss, our total liability is limited to the amount you paid us for the app in the 12 months before the problem. Nothing in these terms limits liability that the law doesn't allow us to limit.

Contact

Questions about these terms: support@plainstackapps.com.