Caution: This post was published in 2017 and may contain information, techniques, or code examples that are no longer current. Please double-check official documentation and modern best practices before using anything from this article.

Checkout problems upgrading to Magento 1.9.3.4+

Magento version 1.9.3.4 include patch SUPEE-9767 V2 which includes security patching for the checkout process.

For your current front-end templates to work with this patch you will need to include a form key value to a number of forms in the checkout process.

<?php echo $this->getBlockHtml('formkey') ?>

Load the templates below from your  app/design/frontend/<package>/<theme> directory and add the Form Key code above between the <form> and </form> tags on each.

The basic templates that will need upgraded:

If persistant checkout is enabled:

If you allow shippinng to multiple addresses:

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