Use companies like MaxMind to assist you. They detect and display information that will help you determine whether or not an order is likely to be fraudulent.
You can also do simple things, like checking to see if the domain name they are trying to host is registered in there name, if their Payment information checks out (PayPal email same as contact email) and more. But Maxmind would be a great start.
Using MaxMind would be recommemnded.
But you do hold the support team yourslf,you can absolutely do it yourself.
Payment fraud: mostly need to locate the IP address where he/she ordered and compared with the IP address he/she supply on your information page.Email address,whois his'her domain.
Other: like hostbite said.
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We use MaxMind which is intergrated with our billing system (WHMCS). Very reliable, but there is always ways and means of bypassing its checks. Currently we just have it checking to ensure the client's IP matches that of the country they select upon order, and we disable orders from client's using an open proxy.
watch what they order - typically if someone wants to pay annually on the highest package with every addon maxed out, they would contact you for a quote of some kind beforehand or have a chat with you.
maxmind within WHMCS does it for us (automatically zapping order, but before whmcs maxmind manually on anything that looked suspect.
Also gut instinct, look atthe domain name does it look suspect - normally a spammer /fraud order giveaway
For dedicated server we always require a verified Paypal account
and Government issued ID. We also do a phone call to the buyer.
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