Hello

Chargebee and Stripe have similar integration/configuration flow. It means that you need to register a plan for each membership and market product in payment provider. In case of Paid Levels you need to take an auto-generated memberthip name (in UNA) and use it to create plan in Chargebee.
Also don't forget about credentials. Both Stripe and Chargebee have 2 sets of credentials: for live site and test site. In this case if you want to test payments first then you need to create necessary plans in Test mode too.

For more info take a look at Paid Levels configuration settings here.

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Best Regards
Anton