How to replace the Shopify checkout, and keep your orders in Shopify

On a standard Shopify plan you cannot edit the checkout page itself, and full checkout replacement is normally a Shopify Plus feature. You can, however, point your checkout button somewhere else: the storefront, products and theme stay in Shopify, the buyer pays on a different checkout page, and the paid order is written back into Shopify so fulfilment carries on as normal.

That is what "replacing the Shopify checkout" means in practice. It is not a theme tweak and it is not an app that adds a badge. It is a change to the most important page you own, so it is worth understanding exactly what moves, what stays, and how to judge whether a replacement is any good before you send real buyers through it.

What Shopify lets you change on a standard plan

Shopify requires its own checkout for most stores on standard plans. You get to change some things and not others.

You can usually adjust logo, colours and fonts, choose one-page or three-page, and set which fields you ask the buyer for. That is cosmetic control, not structural control.

What you cannot do on a standard plan is rewrite the checkout flow, add arbitrary custom blocks anywhere you like, or replace the page with your own. You also cannot escape Shopify's commercial terms: third-party payment gateways can be connected, but Shopify charges an additional transaction fee when you do not use Shopify Payments.

So there are really two reasons people look for an alternative. Either they want control over the page that Shopify will not give them below Plus, or they want the card charge to run through a different processor. A replacement checkout answers both of those, which is also why it is a bigger decision than installing an app. Whatever your Shopify plan charges you stays between you and Shopify, so do not pick one on the assumption that it changes those terms.

What actually moves when you replace the checkout

This is the part most people get wrong when they picture it. Almost nothing moves.

What stays in Shopify: your storefront, your theme, your product pages, your products, variants and prices, inventory, discount codes, shipping rates, tax settings, Shopify Markets currencies, your orders, fulfilment, and your customer list. You keep working in the Shopify admin the way you always have.

What moves: the checkout page itself, and the card charge. That is the whole scope.

The mechanism is simple. Your checkout button sends the buyer to a hosted checkout instead of Shopify's. The buyer pays there. When the payment succeeds, the order is written back into Shopify with the payment recorded, so your fulfilment app, your inventory counts and your customer emails all behave as they did before.

If a vendor cannot explain the write-back step clearly, stop there. A checkout that takes money without creating a matching Shopify order leaves you reconciling by hand forever.

The checklist: six questions to ask any replacement checkout

Use these on any vendor, including this one. Each maps to a way stores lose money quietly after switching.

1. Does it quote live shipping and tax from Shopify?

If the checkout uses its own flat rates, every order with unusual shipping is either undercharged or scares the buyer off. Tax is worse, because the mistake compounds silently across every order until someone notices. Ask whether rates and tax are fetched from your Shopify settings for the buyer's actual address at the moment of checkout, or hardcoded on the vendor's side.

2. Do your discount codes still work?

Codes live in Shopify. If the new checkout does not read them, every campaign you have ever sent breaks, and you find out from support tickets. Ask whether codes are validated against Shopify at checkout time or re-entered into a second system.

3. Do your Markets currencies survive?

If you sell internationally, buyers browse in their own currency and then get thrown onto a checkout priced in yours. That is a conversion problem and a trust problem. Ask whether the checkout follows the buyer's Shopify Market.

4. Are paid orders written back to Shopify?

Covered above, but ask the follow-up too: what happens when a payment is partial or odd. A system that only handles the clean case will hand you the messy cases as manual work.

5. Do your pixels still fire?

Your Meta, TikTok and Google tracking sits on your theme. The checkout is a different page, so purchase events do not follow automatically. If purchase events stop, your ad platforms lose their optimisation signal and your reported ROAS falls apart. Ask specifically which events fire on the new checkout.

6. Can you undo it?

The most important question and the one people skip. Ask what turning it off looks like: is it a switch, or is it a support ticket and theme surgery. If you cannot get back to Shopify's own checkout within a minute, you are making a one-way decision.

How Pendym answers each one

Pendym replaces the Shopify checkout with a hosted checkout that charges cards through your own Whop account. Here is the same checklist, answered directly.

On the messy cases: an underpayment is marked partially paid and held for review rather than shipped, so a short payment does not quietly become a dispatched parcel.

On subscriptions: a Shopify selling plan in the cart becomes a recurring plan at Whop, renewals create new Shopify orders, and cancelling from the Pendym dashboard cancels at Whop.

The speed point most people miss

A hosted checkout usually means the buyer clicks and waits while a session is created, prices are calculated and a page is built. That pause sits at the exact moment you can least afford one.

Pendym prepares the checkout session while the buyer is still on the cart page. By the time they click, the order is already priced, so the click is a plain page change rather than a wait. It is a small design choice, and it shows up in the gap between clicking checkout and seeing a payment field.

What it costs, and how the fee is charged

Pendym has no monthly fee and no setup fee. It charges 0.3% per order.

The detail worth reading twice: that fee is billed to a card you verify with Stripe at signup, not deducted from your Whop payout. Your payout is never short. Whop's own processing fees apply as they would on any Whop sale, so budget for those separately.

Setting it up: the three connections

Setup is about fifteen minutes and comes down to three connections. Here they are, followed by the checks worth doing straight afterwards.

1. 1Connect a Whop account. Either paste your company id (it starts with biz_), an API key and a webhook secret, or let Pendym create a payment account in your name.
2. 2Connect your Shopify store with one click. This installs an app called Pendym Connector.
3. 3Turn Pendym on in your theme. Use the one-click link that opens the Shopify theme editor with the app embed already switched on, then press Save. If you would rather do it by hand, paste one script line into theme.liquid before the closing body tag.
4. 4Set up branding and pixels. Choose layout, colours, custom blocks, and one-page or two-page flow, with a live preview. Paste your Meta, TikTok and Google IDs.
5. 5Place a real test order. Buy something small yourself, at full price, through the live checkout.
6. 6Check the order in Shopify. Confirm it appears with the payment recorded, the right shipping, the right tax, and the right currency. Then check your pixel events landed.

Step five is not optional. Do it before you tell anyone you have switched, and do it again if you sell into multiple countries, once per market.

If you want the checkout on your own domain, you can set a custom checkout domain such as checkout.yourstore.com with one CNAME record. It is verified before buyers are sent there.

<script src="https://pendym.com/shopify-snippet.js" data-store="YOUR_STORE_ID" defer></script>
</body>

Honest limits, and who this is not for

This is a bigger change than an app, and it should be treated like one.

• It requires a Whop account. Whop is a platform for selling digital products, memberships and subscriptions, with its own checkout, payouts and dispute tooling. If you are not willing to run payments through Whop, this is not the route for you.
• You are adding a dependency to your revenue path. The reversal switch is genuinely one click, but a replacement checkout is still a system between your buyer and your money.
• Pendym is a young product. If you need a long track record before you will change your checkout, wait.
• Disputes come from Whop, not Shopify. Whop is enrolled with the card networks. Disputes appear in Pendym matched to the order with the response deadline, and you can file the evidence packet back to Whop in one click. Whop also sells optional Early Dispute Alerts at about $29 an alert, enabled in the Whop dashboard.
• If your only complaint about Shopify checkout is the colours, use Shopify's branding settings and save yourself the change.

Who it does suit: stores that want checkout control Shopify reserves for Plus, or that want the card charge to run through their own Whop account, and who are willing to test properly before switching traffic over.

What you get beyond the basics

Once the checkout is yours, a few things become possible that were not before. Order bumps in the summary. Post-purchase offers charged to the card on file. Fraud rules you configure. Custom blocks in the checkout itself, with layout, colours and one-page or two-page flow, all with a live preview.

These are the reason most people want the checkout in the first place. They are also the reason to test carefully, because each one touches the page where money changes hands.

How to decide

Run the six questions against whatever you are considering. Write down the answers. Any vendor that is vague on live shipping and tax, on order write-back, or on turning it off is telling you something.

Then place a real order yourself before you place any weight on it. A checkout you have personally bought through, in your own currency and one other, with a discount code applied, is a checkout you actually know something about.