Try this —

1) Disable TEST MODE in your Authorize.Net account. In TEST MODE Authorize.net does not return a string.

2) Reset your transaction key in your Authorize.Met account and enter the new key in Admin -> settings -> 3rd party billing.

3) Upgrade or re-install Curl to the latest available version. Curl is a free download from (http://curl.haxx.se)

4) Leave the MD5 Hash value empty

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