Go to Modules in the Left Navigation and search for authnet -> Click on the Authorize.net module -> Click the tab that says Files -> Click Upload, check the box that says Overwrite, and browse to the new module on your local computer, then click Upload. -> Once the module is Uploaded, click Update -> Click the Information Tab and check the module version number, if it says 4.2403 then you've successfully updated (and your Authorize.net issues should be solved) * This module version fixes a bug in the md5hash feature that would reject the transaction if there were commas in the address.* **This module does not require a commerce library but DOES require OpenSSL to be installed on the server.**
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