UltraCart transaction fee ? 0% 0% 0% 0%
Free SSL certificate ?✓✓✓✓
Single-page checkout✓✓✓✓
REST API checkout — ✓✓✓
Guest checkout & customer accounts✓✓✓✓
Real-time carrier shipping rates (USPS, UPS, FedEx)✓✓✓✓
Rotating / load-balanced payment gateways — ✓✓✓
Chargeback dispute automation✓✓✓✓
One-click post-purchase upsells✓✓✓✓
Stripe✓✓✓✓
PayPal✓✓✓✓
Apple Pay✓✓✓✓
Google Pay✓✓✓✓
Bring your own payment gateway ?✓✓✓✓