If you are using Sage Pay Form and wish to test whether the integration is working correctly or not you can use the following test credit card numbers for placing orders.
Visa (VISA)
4929000000006
MasterCard (MC)
5404000000000001
Visa Debit / Delta (DELTA)
4462000000000003
Solo (SOLO)
6334900000000005
Issue 1
UK Maestro / International Maestro (MAESTRO)
5641820000000005
Issue 01
American Express (AMEX)
374200000000004
Visa Electron (UKE)
4917300000000008
Please enter a future credit card expiry date.