Why are all my Authorize.NET charges showing Failed in the invoice report?

If your site is using authorize.net for cc processing and was working until today, and now shows 'failed' for all charges, it is likely due to changing your password at authorize.net.  To remedy this, simply go to your site's admin.epc, and edit 'store settings'.  Then look for the field merchantke and put the new authorize.net password there, and hit save.  That should solve the issue.
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