Skipjack's documentation covers two different processors. Our system will check the value in the advanced settings for DEMO and use it to send specific values to Skipjack. You can enter TRUE, DEMO, TSYS and or GLOBAL and we'll send a test visa card value of: 4445999922225 with expiration 12/22. If your merchant account is managed by FTPS then enter FTPS in the DEMO advanced setting. These tests will return APPROVED.