Choosing the right payment processor depends on your business model. We break down the top five — Stripe, Shopify Payments, PayPal, Square, and Helcim — with fees, global support, and key strengths so you can pick the one that fits your store.
Every e-commerce store needs a way to take money from customers. But the right processor for a global SaaS business looks very different from the one a local boutique needs. Your choice affects everything — transaction costs, customer trust, international reach, and even which platforms you can use.
We looked at the leading payment processors across five categories: developer flexibility, platform integration, buyer trust, omnichannel support, and transparent pricing. Here's what we found.
| Processor | Best For | Transaction Fee (typical) | Global Support |
|---|---|---|---|
| Stripe | Developer flexibility & global reach | 2.9% + $0.30 | 135+ currencies |
| Shopify Payments | Shopify store owners | 2.4%–2.9% + $0.30 | Limited to Shopify markets |
| PayPal | Buyer trust & brand recognition | 2.99% + $0.49 (online) | 200+ countries |
| Square | Omnichannel (online + in-person) | 2.6% + $0.10 (online) | US, Canada, Japan, AU, UK, IE |
| Helcim | Cost-conscious US/Canada sellers | Interchange + 0.20%–0.50% | US & Canada |
Stripe is the industry standard for a reason. It supports over 135 currencies and offers a developer-first API that lets you build exactly the checkout flow you want.1 Its fraud prevention tool, Stripe Radar, uses machine learning to block fraudulent transactions before they hit your account.
Why it wins: If you need to sell internationally, handle subscriptions, or build a custom checkout, Stripe is the most capable option. It integrates with nearly every major e-commerce platform and has a vast ecosystem of plugins.
Trade-off: You'll need some technical comfort to get the most out of it. Non-technical founders may find the setup steeper than an all-in-one solution.
If you run a Shopify store, Shopify Payments is almost a no-brainer. Using it removes the third-party transaction fees that Shopify charges when you use an external processor — typically an extra 0.5%–2% per transaction.1 It also unlocks Shop Pay, which can boost conversion rates by letting customers save their payment info across Shopify stores.
Why it wins: Seamless integration, no extra fees, and higher conversion through Shop Pay. Everything lives in one dashboard.
Trade-off: You're locked into the Shopify ecosystem. If you ever leave Shopify, you'll need to switch processors entirely.
PayPal is the most recognized online payment brand globally. Many shoppers simply expect it as a checkout option — especially for high-ticket items or cross-border purchases where they want buyer protection.1 It operates in over 200 countries and 25 currencies.
Why it wins: Trust. Customers who see the PayPal logo at checkout are more likely to complete a purchase. It's also a great secondary option to pair with a primary processor.
Trade-off: Fees are higher than most competitors (2.99% + $0.49 for online transactions), and the merchant dashboard is less polished than Stripe or Square.
Square started as a point-of-sale system for in-person payments, but it has grown into a full e-commerce platform. Its strength is unifying online and offline sales in a single dashboard — inventory, payments, and analytics all in one place.1 Square also doesn't charge chargeback fees, which can save merchants money.
Why it wins: If you sell both in a physical location and online, Square gives you one system to manage everything. It's also very easy to set up — no coding required.
Trade-off: Global support is limited compared to Stripe or PayPal. Best for US-based businesses.
Helcim offers transparent interchange-plus pricing — meaning you pay the actual interchange fee set by the card networks plus a small markup (0.20%–0.50%).1 For high-volume merchants, this almost always beats flat-rate pricing.
Why it wins: If you process significant volume and want the lowest possible fees, Helcim's pricing model is hard to beat. No hidden markups, no long-term contracts.
Trade-off: Currently only available in the US and Canada. The feature set is more basic than Stripe or Square.
Here's a quick decision framework based on your situation:
You sell globally or need a custom checkout → Go with Stripe. It's the most flexible and widely supported option for international e-commerce.
You run a Shopify store → Use Shopify Payments. You'll avoid extra fees and get access to Shop Pay. You can always add PayPal as a secondary option.
You want to maximize buyer trust → Add PayPal as a payment option alongside your primary processor. Many customers won't complete a purchase without it.
You sell both online and in a physical store → Choose Square. Its unified dashboard makes omnichannel management simple.
You're cost-sensitive and in the US or Canada → Look at Helcim. Interchange-plus pricing saves money as your volume grows.
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