I have a business merchant account. I logged in and created two Sandbox accounts: a buyer and a seller. When I click on the Sandbox test site link, it wants me to log in again. I've tried logging in with my actual business email and password and I get an error. I've tried logging in with my "buyer account" email and password and I get an error. How do I create a fake Buy Now button to use on a test website? I have spent hours trying to get this working, to no avail.
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