Payment Sense has a nice easy to use test system so you can test the system before going live.
Sign up for an account:
https://mms.paymentsensegateway.com/Pages/PublicPages/RegisterMerchant.aspx.
You can use the following test address/visa card to test the system (more are found in their docs depending on your settings). Check the docs for the latest expiry
dates if the date below has expired.
Visa Card: 4976000000003436
Expiry: 12/20
Start Date: 01/07
CV2: 452
Address: 32 Edward Street, Camborne, Cornwall, TR14 8PA.