In order to get a demo account from Swissbilling, please request a contract.
You can do this with your Payrexx account under Payment Provider > Alternative Payment Methods > Set up SWISSBILLING.
Within 3-4 days you will receive a demo account and a merchant ID with a password directly from Swissbilling. You can then enter these under Payment Provider > Alternative Payment Methods > Set up SWISSBILLING:
When you have finished setting up the test account, you can request the live activation of the account by sending an e-mail to firstname.lastname@example.org.