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Is it possible to use both a sandbox account and a live account on the same front-end webpage or do I need to have two separate front-end webpages (one for the sandbox account and the other for the live account)?

Is there any associated billing address for the test credit card numbers mentioned here: http://community.developer.authorize.net/t5/Integration-and-Testing/Test-Credit-Card-Numbers/td-p/7653 or would any billling address work? Also, do the test cred...