This article also answers:
Is it possible to configure multiple gateways of the same type with a Chargebee site?
Can I use my existing gateway account with my Chargebee site or do I need a new one?
Yes, this is possible. You can not only configure multiple payment gateways, you can also configure multiple accounts of a single gateway with Chargebee.
Note:
With Chargebee's smart routing feature you can designate a currency to a particular payment gateway. Click on “Manage Rules” to accomplish this. Details here.
You also have the option to add a descriptor that lets your customers identify you on their transactions. Details here.
The number of card gateways you can configure depends on the plan you are on with Chargebee. Please check out pricing page for more information on this.