Create a sandbox account here.
You will get following credentials after the setup:
- Login ID: 8R6TFt6m693
- Transaction Key: 2x72742a3pDPq5Yy
- Secret Key: Silon
Now, you can login into the portal using your USERNAME and PASSWORD.
A gateway ID is also sent to your registered email.
You can use the LOGIN_ID and TRANSACTION_KEY to create transactions on Authorize.net API.