NATS Safety
 

How safe is NATS? Can it be tampered with? I am thinking about refunds, sales, etc.

It is a piece of software, of course it can be manipulated in almost any way the person wants.

exactly... In the end all data is just entry in database... all you need to do is just change it :)

That's sad. I had a referred client who had signed up to 3 sites from a program but the next day "refunded". The same client had signed up to a different site from a different program and all good.

Yes, someone can safely get refunded.
You need clients who do not request refunds.

Are you sure this a nats thing and not a payment processor thing?

Nats doesn't collect any billing data, nor does it handle payments; so if a charge was refunded, it happened through the payment processor because Nats also doesn't have an option to issue refunds, and only ever gets that data from the processor.

Its nothing to do with nats. It's biller who refund it. NATS do have feature that person chargedback in past will never signup for site or sites if using the same previous email address.

are you incentivising these signups in an attempt to profit from them?

Sounds like it. Three completely different sites in one day?