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Recently there was a spike in Authorize.net customers that reported their sites credit card processing errors which, according to log files resulted in the following error produced:

CURL ERROR: SSL certificate problem: self signed certificate in certificate chain

Fix:

• Download and unarchive SDK
  https://codeload.github.com/AuthorizeNet/sdk-php/tar.gz/2.0.0
• Find ./lib/ssl/cert.pem file in it and upload it to the server
• Find cert.pem file in their account and make a backup of it. Replace it with the cert.pem file from the previous step.

Testing (oneliner):

echo | openssl s_client -connect apitest.authorize.net:443 -showcerts -verify 10 -CAfile /home/path/to/cert.pem

Make sure to replace “/home/path/to/cert.pem” with the real path. If all is good you’ll get something like this at the end:

Verify return code: 0 (ok)

Otherwise you’ll see:

Verify return code: 19 (self signed certificate in certificate chain)