Payments: much choice, but Shopify penalises alternatives
Only Shopify offers payment processing built into the platform (transaction fees above). Alternatively, you can integrate with many other payment gateways, for example PayPal, Amazon Pay, third party processors, and many international payment providers like Alipay Global, BitPay and ePay.
If you plan on using another card processor, Shopify doesn’t charge the Shopify transaction rate, but you are charged an additional fee on top of the rates going to your chosen card machine provider. This additional “penalty rate” is between 0.5% and 2% of the transaction total depending on your subscription, which can make the overall transaction cost quite high.
BigCommerce hasn’t got a ready-made payment processing system, instead requiring you to integrate with any of 23 external payment gateways compatible in the UK, e.g. Adyen, Authorize.net, Klarna, PayPal, Sage Pay, Square, Stripe and PayPal. These have different costs associated, sometimes with a setup fee for the integration, but BigCommerce does not add their own fee on top like Shopify does.