What to do when Shopify checkout is not working?

Few things are as frustrating—and as costly—for an online merchant as discovering that their Shopify checkout is not working. Every minute your checkout process is broken is money lost: customers abandoning carts, sales not converting, reputation being damaged. And the worst part is that often the problem isn't obvious: the checkout can silently fail for some users while others shop without issues.

At YoSoyShopify, as a certified Shopify Partner specializing in store maintenance in LATAM, we have diagnosed and resolved checkout problems in stores in Mexico, Argentina, Colombia, Chile, and Peru. Checkout errors have recognizable patterns and, in the vast majority of cases, they have a solution. The problem is knowing where to look.

In this comprehensive guide, we explain what to do when your Shopify checkout isn't working: how to diagnose the problem, what the most frequent causes are, how to resolve them step by step, and how to prevent them in the future. Additionally, you'll find an actionable checklist, frequently asked questions answered within the content, and three calls to action to get professional help when you need it.

"In the middle of difficulty lies opportunity." — Albert Einstein

Why does Shopify checkout fail? Most common causes

The Shopify checkout process is one of the most robust e-commerce systems, but it's not infallible. When the checkout fails, it's usually due to a combination of factors: incorrect configuration, conflicts between apps, payment gateway issues, or theme errors. Understanding the root cause is the first step to solving it.

How do I know if my Shopify store's checkout is failing? The clearest indicators are: a sudden increase in cart abandonment rate, customers reporting they cannot complete their purchase, orders not appearing in the Shopify dashboard after a payment attempt, or visible errors on the checkout screen. You can also detect it by checking Google Analytics 4: if the conversion funnel shows an abrupt drop in the payment step, there's a problem.

The most frequent causes of a Shopify checkout not working are:

• Payment gateway issues: Expired credentials, suspended account, incorrect configuration of MercadoPago, PayPal, or other gateways.
• Conflicts with installed apps: Discount, upsell, personalization, or analytics apps that inject scripts into the checkout and create conflicts.
• Errors in the theme or Liquid customizations: Modifications to the checkout.liquid file (available on Shopify Plus plans) or scripts in the checkout editor that generate JavaScript errors.
• SSL/HTTPS issues: Expired or misconfigured SSL certificate that prevents the checkout from loading correctly.
• Incorrect shipping configuration: If no shipping zones are configured for the customer's country, the checkout may get stuck at the shipping step.
• Inventory restrictions: Out-of-stock products or incorrectly configured inventory policies that prevent proceeding with the checkout.
• Issues with discounts or promotional codes: Incorrectly configured discount codes that generate errors when applied.
• Incidents on the Shopify platform: Although rare, issues at Shopify's infrastructure level can affect checkout globally.

Can Shopify checkout fail for only some users and not others? Yes, and this is especially common. A problem can affect only users of a certain browser, device, country, or payment method. For example, a JavaScript conflict might fail in Chrome but not in Safari, or a shipping zone problem might affect only customers in Colombia but not in Mexico.

How do I check if the problem is with Shopify or my store? Consult the official Shopify status at shopifystatus.com. If there's an active incident affecting checkout, you'll see an alert. If Shopify's status is normal, the problem is with your specific store's configuration.

How to diagnose the Shopify checkout problem step by step

Before attempting to fix a Shopify checkout error, you need to correctly diagnose the problem. An accurate diagnosis saves you hours of trial and error.

Step 1: Reproduce the error yourself

The first thing is to try to reproduce the error in your own store. Open your store in incognito mode (to avoid cache and cookies), add a product to the cart, and proceed through the checkout process to the point where it fails. Document exactly what happens: does an error message appear? does the page not load? does it freeze at a specific step?

Why should I use incognito mode to test Shopify checkout? Incognito mode clears browser cache, cookies, and active extensions, giving you an experience closer to that of a new customer. Many checkout problems are related to cached data or browser extensions interfering with Shopify scripts.

How can I make a test purchase on Shopify without charging real money? Shopify offers a test payment mode. Go to Settings > Payments and activate the Bogus Gateway test payment provider (available when Shopify Payments is not active) or use your payment gateway's test cards (MercadoPago, PayPal, etc.) in sandbox mode.

Step 2: Identify at which checkout step it fails

Shopify checkout has several steps: contact information, shipping address, shipping method, payment information, and confirmation. Identifying which step fails is crucial for diagnosing the cause:

• Fails at the shipping step: Problem with shipping zones, rates, or geographical restrictions.
• Fails at the payment step: Problem with the payment gateway, credentials, or payment method configuration.
• Fails when applying a discount: Incorrectly configured discount code or conflict with other promotions.
• Fails at confirmation: Problem with webhooks, notifications, or the thank you page.
• Fails when loading checkout: Problem with SSL, app scripts, or the theme.

How do I check for JavaScript errors in Shopify checkout? Open your browser's developer tools (F12 in Chrome), go to the "Console" tab, and reproduce the error. JavaScript errors will appear in red. This helps you identify if a specific app or script is causing the problem. If you see errors related to a specific app, that's your main clue.

Can I see checkout error logs in the Shopify dashboard? Shopify does not offer checkout error logs directly in the admin panel. However, you can check the Activity log in Settings > Activity log to see recent actions. For more detailed logs, you need external tools like Google Analytics 4 or Hotjar to record user sessions in the checkout.

Solutions for the most common Shopify checkout errors

Once you've diagnosed the problem, it's time to fix it. Here are solutions for the most frequent Shopify checkout errors we find in LATAM stores.

Solution 1: Payment gateway issues
If the checkout fails at the payment step, the first thing to do is check the status of your payment gateway. For MercadoPago: go to Settings > Payments in Shopify and verify that MercadoPago is active and that the credentials are for production (not sandbox). For PayPal: verify that your PayPal account is verified and active. Disconnect and reconnect the gateway if the problem persists.

What do I do if MercadoPago rejects payments in Shopify checkout? First, check if the rejection is from MercadoPago or Shopify. Log in to your MercadoPago panel and check the "Activity" section to see if the transactions appear as rejected and why. The most common rejections are: insufficient funds, incorrect data, card limits, or fraud detection. If the rejection is systematic for all cards, the problem is with the integration configuration.

Solution 2: Conflicts with installed apps
Apps are the most frequent cause of checkout problems. To identify if an app is the culprit, temporarily deactivate them one by one and test the checkout after each deactivation. Start with apps that inject scripts into the checkout: upsell, cross-sell, automatic discounts, live chat, personalized analytics.

Which Shopify apps commonly cause problems in checkout? The apps that most frequently cause conflicts in checkout are: automatic discount apps, post-purchase upsell apps, product personalization apps, live chat apps with aggressive scripts, and analytics apps that modify checkout behavior. This does not mean they are bad apps, but they can conflict with others or with Shopify updates.

Solution 3: Shipping zone issues
If the checkout gets stuck at the shipping step, check your shipping zone configuration in Settings > Shipping and delivery. Make sure the customer's country is included in an active shipping zone. If you sell in Mexico, Colombia, Argentina, and Chile, each must be in a shipping zone with at least one rate configured.

Why does Shopify checkout not show shipping options for some customers? This happens when the customer's address does not match any configured shipping zone, when all products in the cart have free shipping but there is no $0 rate configured, or when there is a conflict between shipping profiles. Check that each shipping zone has at least one active rate, including a $0 rate if you offer free shipping.

Solution 4: Discount code issues
If the checkout fails when applying a discount code, check: that the code is active and within the validity period, that it has not reached the usage limit, that the products in the cart meet the discount conditions, and that there are no conflicts with other active automatic discounts.

Can I combine multiple discounts in Shopify checkout? Shopify allows combining discounts on plans that support this feature. However, combining discounts can lead to conflicts if not configured correctly. Go to Discounts in your Shopify panel and check the combination settings for each active discount.

Solution 5: SSL and security issues
Shopify checkout requires HTTPS to function. If your SSL certificate has issues, the checkout may fail or display security warnings that scare away customers. Go to Settings > Domains in Shopify and verify that your domain has active SSL. Shopify automatically manages SSL certificates for connected domains, but if there's a DNS propagation issue, SSL may temporarily fail.

How do I know if my Shopify store's SSL is causing checkout problems? Open your store in Chrome and click the padlock icon in the address bar. If it shows "Secure connection," SSL is working. If it shows a warning or the padlock is crossed out, there's an SSL problem. You can also use tools like SSL Labs to perform a complete diagnosis of your certificate.

Solution 6: Clear cache and test on multiple devices
Some checkout problems are specific to the customer's device or browser. Ask several users to test the checkout from different devices (mobile, tablet, desktop) and browsers (Chrome, Safari, Firefox, Edge). If the problem only occurs in a specific browser, it's likely a JavaScript conflict or a browser extension.

Does Shopify checkout work differently on mobile than on desktop? Shopify checkout is designed to be responsive and work the same on all devices. However, some app scripts or theme customizations may behave differently on mobile. In LATAM, where more than 70% of purchases are made from mobile devices, it is critical to test checkout on mobile regularly.

What do I do if Shopify checkout fails only for customers in certain LATAM countries? Verify that the customer's country is in your shipping zone, that your payment gateway accepts cards from that country, and that you do not have geographical restrictions configured in your store. Also, check if you have Shopify Markets configured and if market rules are affecting checkout for that country.

How to prevent Shopify checkout problems

The best strategy to prevent your Shopify checkout process from failing is preventive maintenance. Here we share best practices to keep your checkout running optimally.

How often should I test my Shopify store's checkout? We recommend performing a complete test purchase at least once a week, and always after: installing or updating an app, changing payment or shipping settings, updating the theme, creating or modifying discounts, or making any changes to the theme code. During high-demand seasons like Buen Fin in Mexico, Hot Sale or Cyber Monday, test checkout daily.

Key preventive practices to keep your Shopify checkout working:

• Continuous monitoring: Set up alerts in Google Analytics 4 to detect drops in the checkout conversion rate.
• Regular testing: Perform weekly test purchases from different devices and browsers.
• App management: Uninstall apps you don't actively use. Each installed app is a potential conflict risk.
• Controlled updates: Before updating the theme or installing a new app, create a backup and test on a duplicate theme.
• Credential review: Monthly verify that your payment gateway credentials are current and correct.
• Shopify Status monitoring: Subscribe to Shopify Status notifications to receive alerts of platform incidents.

Does Shopify automatically notify me if checkout fails? Not directly. Shopify does not have an automatic alert system for checkout issues. That's why it's essential to set up your own monitoring system: Google Analytics 4 with conversion alerts, uptime monitoring tools like UptimeRobot, or session recording services like Hotjar or Microsoft Clarity to detect friction in the checkout.

What is Shopify Checkout Extensibility and how does it affect my store? Checkout Extensibility is Shopify's new system for customizing checkout without modifying the base code. It replaces the old checkout.liquid (which was only available on Shopify Plus) and allows extensions to be added more securely and stably. If you have old customizations in checkout.liquid, consider migrating to Checkout Extensibility to reduce the risk of conflicts. You can find more information in the official Shopify developer documentation.

"Quality is never an accident; it is always the result of intelligent effort." — John Ruskin

Actionable checklist: Diagnose and fix Shopify checkout that isn't working

Use this systematic checklist when your Shopify store's checkout fails:

• ✅ Check Shopify status at shopifystatus.com to rule out global incidents.
• ✅ Reproduce the error in incognito mode from different browsers (Chrome, Safari, Firefox).
• ✅ Identify at which specific checkout step it fails (shipping, payment, discount, confirmation).
• ✅ Check the browser's error console (F12) to identify JavaScript errors.
• ✅ Verify that your payment gateway (MercadoPago, PayPal, etc.) is active and has correct production credentials.
• ✅ Temporarily deactivate installed apps one by one to identify conflicts.
• ✅ Check shipping zone configuration: all destination countries must have at least one active rate.
• ✅ Check active discount codes: verify validity, usage limits, and conditions.
• ✅ Verify the SSL status of your domain in Settings > Domains.
• ✅ Test the checkout from mobile devices (iOS and Android) and desktop.
• ✅ Complete a test purchase using Shopify's test payment mode.
• ✅ Verify that items in the cart have available stock or correct inventory policy.
• ✅ Check for pending updates for checkout-related apps.
• ✅ Contact your payment gateway support if the problem is specific to payment processing.
• ✅ Document the error with screenshots and share them with your Shopify Partner for faster diagnosis.

Conclusion: A working checkout is your most valuable asset

The Shopify checkout is the heart of your online store. When it works well, it's invisible: customers buy without friction, and you receive orders. When it fails, everything stops. Therefore, keeping your checkout functioning correctly is not optional: it is the top priority for any serious online store.

In LATAM, where trust in e-commerce is still being built and buyers are especially sensitive to any friction in the payment process, a broken checkout can permanently damage your reputation. A customer who couldn't complete their purchase in your store in Mexico, Colombia, or Argentina will likely not try again.

The good news is that the vast majority of checkout problems have a solution. With the right diagnosis, the appropriate tools, and the support of a certified Shopify Partner, you can resolve any checkout issue and establish a preventive maintenance system to avoid it happening again.

At YoSoyShopify, we have resolved checkout problems in dozens of stores across LATAM. If your checkout is failing or you simply want to ensure it's working optimally, we are just a message away.