Hi,
I did a custom integration for David, and sent him this message. It addressed the issue. This is a DIY post. Please do not ask me to fix your site if this doesn’t work for you.
Or, wait for Zack to update the plugin on www.remarpro.com
The certificate file will be located in a subdirectory of your wp-content/plugins directory. Make sure the file exists before attempting to replace it.
/wp-content/plugins/infusionsoft/Infusionsoft/infusionsoft.pem
This link has the certificate:
https://github.com/infusionsoft/PHP-iSDK/blob/master/src/infusionsoft.pem
Load it (without line numbers). If the “Copy to Clipboard” icon doesn’t work for you, click the “Raw” button to load the text without line numbers, select all and copy to clipboard. Either way, paste to a text editor. Save it as plain text file named “infusionsoft.pem”
Upload the file on your computer named “infusionsoft.pem” to your wordpress infusionsoft plugin directory
/wp-content/plugins/infusionsoft/Infusionsoft/
Edit: remove cert, as it was truncated. You’ll have to get the cert from github