First: You may be trying to use a live Authorize.net account with the CIM payment module set to test mode, or vice versa. Make sure the 'Sandbox Account' setting is correct for your account type, or your API keys will give an error.
If you are trying to test Authorize.net
In order to test CIM payment processing, you need to sign up for a free developer account at Authorize.net. The account type must be 'card not present.'
After registering, you will be given an API Login ID and Transaction Key. Save these, then copy them into the Magento configuration at Admin Panel > System > Configuration > Payment Methods > Authorize.Net CIM. Also set 'Sandbox Account' to 'Yes', then save.
If you are trying to use Authorize.net on your live site
To handle to live payment processing with CIM, enter your real Authorize.net account details (API Login ID and Transaction Key) and set 'Sandbox Account' to 'No'. Your Authorize.net account details must be entered accurately at Admin Panel > System > Configuration > Payment Methods > Authorize.Net CIM.
If you are still getting an error
Make sure that test mode is not enabled in your account settings at Authorize.Net, and that the Customer Information Manager service (CIM) is enabled. CIM and this extension will not work if your account is in test mode.
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