All SportsTG pages can be tested using the test credit card details, providing the page/form is still in test mode. The test credit card will not work on a live gateway.
Details are -
Card Number: 5555 5555 5555 4444 (enter without the spaces).
Expiry Date: Any future date (Eg: 12/2019)
CCV: Any 3 numbers
The test credit card cannot be used on transactions above $1,000 in value.