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I feel like I'm going crazy with invalid CC responses

So I have a project pointed at the sandbox, hasn't been touched in about 8-12 months. When it was built and deployed all worked fine for testing through the sandbox. I'm using the Authorize.net Nuget package to do the API calls.

So I load up the project now, update the cms, and test the payment callback, and the Visa test cards all come back with "The credit card number is invalid" ...it's the test cards from the testing page, same numbers I've always used.

The Api keys haven't changed at all, and the failed "invalid number" transactions don't show up in the Auth.net sandbox UI.

What could I be missing here?

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