Shop Pay vs PayPal: Which Payment Gateway Should You Choose in 2026?

Choosing a payment gateway sounds like a minor decision. It isn’t. The checkout experience directly affects whether a customer completes a purchase or walks away, and in eCommerce, that gap is often where profit hides.

Both Shop Pay and PayPal are widely used, well-supported, and trusted by merchants. But they solve different problems. One is built for speed; the other for reach. In 2026, the competition has intensified with the introduction of PayPal Fastlane, a direct competitor to Shop Pay’s accelerated checkout. Understanding which matters more for your store is what this guide covers.

Shop Pay is Shopify’s own accelerated checkout tool. It stores a customer’s delivery details and payment information securely, so returning shoppers can complete a purchase in two taps rather than filling out forms from scratch.

Because it runs inside the Shopify ecosystem, there’s no third-party redirect—the customer stays on your store throughout. That single factor has a measurable impact on cart abandonment rates. Shop Pay checkouts have been shown to convert up to 1.72x higher than standard guest checkouts, particularly on mobile devices.

Shop Pay also includes a buy now, pay later option called Shop Pay Instalments, available to eligible customers in the United States, Canada, and the United Kingdom.

PayPal is a global payment platform used by hundreds of millions of consumers worldwide. For many customers, seeing the PayPal logo at checkout is a major trust signal.

In 2026, PayPal has fully rolled out PayPal Fastlane, its own accelerated guest checkout solution. Fastlane recognizes shoppers from the vast PayPal network (over 171M eligible accounts in the US alone) and allows them to autofill payment and shipping details without a password.

Key PayPal Fastlane Stats:

• 50% Higher Conversion: Guest shoppers using Fastlane convert around 50% higher than standard guest shoppers.
• 35% Faster Checkout: Fastlane reduces checkout time by more than 35% compared to standard guest checkout.

For Shopify merchants, Shop Pay is almost always the more cost-effective option. When you use Shopify Payments (which includes Shop Pay), you avoid the 0.5% to 2% additional transaction fee that Shopify charges for using external gateways like PayPal as your only payment method .

PayPal charges its own transaction fees (typically 2.9% + 30¢, though this varies by region). If you use PayPal alongside Shopify Payments, you don’t pay the extra Shopify surcharge on PayPal orders, but you still pay PayPal’s standard rates. For international transactions, PayPal also applies currency conversion surcharges, which can add up quickly for global stores.

Historically, Shop Pay had a massive advantage in speed because it kept customers on-site while PayPal required a redirect. With PayPal Fastlane, that gap has narrowed significantly.

• Shop Pay Advantage: It is deeply integrated into the Shopify ecosystem. If a customer has ever used Shop Pay on any Shopify store, they are recognized on yours.
• PayPal Fastlane Advantage: It leverages PayPal’s massive global network. A customer doesn’t even need a PayPal account to be recognized if they’ve used Fastlane elsewhere.

For Shopify stores, Shop Pay still tends to feel more “native,” but PayPal Fastlane is a powerful tool for capturing guest checkout conversions from customers who haven’t used Shop Pay before.

Both platforms are highly secure, but they offer different types of protection:

• Shopify Protect: Available for Shop Pay orders in the US, it protects merchants against fraudulent chargebacks. If Shopify’s AI approves the order and it later turns out to be fraudulent, Shopify covers the cost.
• PayPal Buyer Protection: This is a major trust signal for consumers. Customers know that if an item doesn’t arrive or isn’t as described, PayPal will likely side with them in a dispute. This familiarity reduces hesitation for first-time purchases.

If you sell internationally, this is where PayPal has a clear edge. PayPal supports over 200 countries and handles multiple currencies natively. For a UK retailer selling into Europe, the US, or further afield, PayPal’s global infrastructure is a practical asset.

Shop Pay’s availability is more limited. It works well for merchants whose primary markets are the UK, US, Canada, and Australia, but if you’re scaling into less common markets, Shop Pay alone won’t cover every customer.

Choose Shop Pay if:

• You run your store on Shopify.
• Your primary markets are the UK, US, Canada, or Australia.
• You want the lowest possible transaction fees.
• You want to leverage Shopify Protect against fraud.

Choose PayPal if:

• You sell across multiple platforms (Magento, WooCommerce, etc.).
• A large portion of your customers is international.
• You want to provide the high trust signal of the PayPal logo.
• You want to use PayPal Fastlane to boost guest checkout conversions.

Adding Shop Pay to Shopify

Shop Pay activates automatically when you enable Shopify Payments. Go to Settings → Payments → Shopify Payments, enable it, then toggle on Shop Pay. Run a test transaction before going live.

If you’re building out a new Shopify store or migrating from another platform, working with certified Shopify developers from the start saves time and avoids technical issues further down the line.

Adding PayPal to Shopify

PayPal integrates directly through Shopify’s payment settings. Go to Settings → Payments → PayPal, connect your PayPal business account, and enable the PayPal button at checkout. Many merchants run this alongside Shop Pay without any conflict.

Adding PayPal to Magento

Magento (Adobe Commerce) supports PayPal through a native extension. Install it, add your API credentials, and configure the display settings for checkout. For more complex Magento builds, particularly those handling multiple currencies or high transaction volumes, it’s worth having an experienced Magento developer configure and test the integration properly.

Having supported over 250 eCommerce projects across Shopify, Magento, and WordPress, our team’s experience is consistent: the stores that convert best tend to offer more than one payment method.

Shop Pay reduces friction for repeat buyers and keeps costs down on Shopify. PayPal builds trust with first-time buyers and covers international markets. Running both isn’t complicated to set up, and the conversion uplift from giving customers a choice is well-documented.

If you’re unsure how your current checkout is affecting sales, or you’re planning a store build or migration, get in touch with our team for a no-obligation conversation. We’re a UK-based team of 30+ certified developers, and we’ve been building eCommerce stores since 2016.