Catalogue & checkout
Gambio
Variants, tiered pricing, vouchers and B2B are all confirmed on the feature list, so the merchandising side is real. But the checkout evidence is one phrase — 'Zahlungsabwicklung mit PayPal & Co.' — with no invoice, no direct debit, no guest checkout and no bundles anywhere in the record, so I cannot credit the German checkout anchor.
Shopware
The variant machinery is genuinely worked — parent-child inheritance, a configurator object over property groups, unlimited properties with filtering — and the payment architecture with synchronous and asynchronous handlers plus a redirect URL returned in the headless API response shows a checkout built to be extended. But I found no public information on bundles, guest checkout, promotions or vouchers, the only payment provider named anywhere is PayPal, and customer-specific prices surface only on the top Beyond plan — good machinery with the conversion features unproven on the captured pages.