Rally says its checkout is platform-agnostic, allowing Merchants to replace their existing traditional checkouts with Rally’s, or build a headless experience, with Rally as the checkout and orchestration layer.

The headless market continues to spin out of control. Personally I think there are way too many headless ecommerce platforms than there are merchants to adopt them.

Insider: After a run-in with Shopify, this founder became convinced that e-commerce platforms were getting too powerful. Now he's raised $6 million for a solution that gives merchants more flexibility.