Short answer
Create an owned wholesale catalog, add RFQ and quote requests, connect your own payment gateway and share the catalog with buyers, reps and channels. Checkout can come after buyer demand is clear.
Why skip a checkout-first setup
Wholesale buyers often need specs, availability, negotiated pricing and repeat ordering before payment.
- Start with a catalog link buyers can browse.
- Capture quote requests and questions.
- Keep your own payment gateway and margin.
- Add marketplaces as channels, not as the core business.