Judging from the forums a lot of people are having this issue, at least intermittently. I'm testing in the sandbox and basically using the straight code from "Example of the Complete HTML Page" at https://developer.authorize.net/api/reference/features/acceptjs.html. I added a couple lines in the responseHandler function to see if the function was being called twice since I've seen that as an issue, and it was. I renamed the function to myResponseHandler as suggested in other topics, but it's still firing twice. Is there an accepted way to fix this? Thanks!