Chargebee Product Catalog 2.0 stores items and item prices. A sync layer that copies WooCommerce orders into Chargebee later never creates those catalog objects from the product you just saved—and checkout still is not Chargebee.js.
Catalog 2.0 from the WooCommerce product
Chargebee Integration creates Catalog 2.0 item wc-{product_id} and item price wc-{product_id}-{CURRENCY} when you save a Chargebee Subscription product. Chargebee.js (or hosted checkout) then collects the card on WooCommerce checkout.
What you should not do
Do not paste a Chargebee hosted form into a WordPress page and call it a Woo integration. Do not rely on Zapier to create subscriptions after Woo has already taken payment. munjr.com itself sells through Chargebee Integration—same plugin, same Chargebee site.
Setup, gateways, and limitations: Chargebee Integration documentation.