Security Requirements

#1
Hello,

I've built an eCommerce site for a customer of mine on my VPS. When applying for the interface with the credit card company I was asked the following questions:
1. What are the OS security measures / applications that are active?
2. How does the access to the source code is being secured?
3. Is there an alerting utility installed to detect a break to the VPS at real time?
4. Was there any test made trying to break into the VPS? challenge it's security level?

I will appreciate your help.

Thanks!
 
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