First data not working

Hello,

It doesn’t seem to work. Please help me. When i fill the details of the credit card and after processing it says Internal server error but when i try any other payment gateway like Paypal. Those work perfectly. So please have a look and let me know the issue.

Here is the link:-

http://airfreshclub.com/
http://airfreshclub.com/product/air-fresh-club-monthly-subscription/

Thanks,
Yogesh

https://ww.wp.xz.cn/plugins/first-data-payment-gateway-for-woocommerce/