From time to time, the PayPal IPN (Instant Payment Notification) may be slow to reach your site. The PayPal IPN updates the payment information in Event Espresso 3. This theme template removes the CSS which makes the page lighter (since less resources are loaded) and therefore allows the transactions page to load a little faster.
An SFTP or FTP client will be needed. FileZilla and Cyberduck are free options that are available for multiple platforms. Using a Mac? Try Transmit.
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Download the simplified transactions theme template from this link to your computer: http://eventespresso.s3.amazonaws.com/2011/09/txnpage.zip
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Locate the file on your computer and unzip it.
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Login to your WordPress root with your preferred SFTP/FTP client.
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Browse to this location:
/wp-content/themes/yourthemefolder
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Upload the PHP file in the unzipped folder from step 2 to the location above using your SFTP/FTP client.
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Login to your WP-admin (WordPress dashboard) and go to Pages. Then find the Transactions page for Event Espresso and click on it.
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Change the layout setting for this page to use the new transactions template. This option appears in the right area of the page editor. If you don't see it, then try toggling Screen Options and then enabling it by placing a checkmark. Afterwards, be sure to save changes to the page.
The simplified transactions theme template is now running on your WordPress site.
Reference:
http://eventespresso.com/wiki/how-to-set-up-paypal-ipn/#troubleshooting