Not showing option on Checkout

Hi,

I have installed this plugin and in backend it shows three options Fat Zebra (MasterPass) | Fat Zebra (VISA Checkout) | Fat Zebra.
I have activated Fat Zebra and Fat Zebra(MasterPass).
and entered Gateway Username, Gateway Token and Gateway Shared Secret. However, within the checkout page in front end, the Fat Zebra option is not showing.

Please Help.

Thanks

https://www.ads-software.com/plugins/woocommerce-fat-zebra-gateway/