WordPress Plugin with Custom Domain

The plugin doesn’t use login.salesforce.com. It’s only interaction with SF is via the web to lead API endpoint:
https://www.salesforce.com/servlet/servlet.WebToLead

That should work with any SF account with the organization ID set correctly.

You can test if this is an issue by creating a standard web to lead, and check what the URL is in the form. To create a web to lead, follow

https://help.salesforce.com/apex/HTViewHelpDoc?id=setting_up_web-to-lead.htm&language=en

And then take a look at the line that starts <form..

does it look like

<form action="https://www.salesforce.com/servlet/servlet.WebToLead?encoding=UTF-8" method="POST">

or does it look like

<form action="https://myorg.my.salesforce.com/servlet/servlet.WebToLead?encoding=UTF-8" method="POST">

If the first, then the fact you are using a custom domain shouldn’t make a difference.

FYI – I’ll add a filter to allow you to override the API endpoint the plugin uses, in case it’s the latter URL. I’m curious to know either way though!

OK, 2.1 (releasing this week) supports the following filter:

salesforce_w2l_api_url
Change the API url the plugin posts data to.

e.g.

add_filter( 'salesforce_w2l_api_url', 'my_w2l_api_url' );

function my_w2l_api_url( $url ){
	return 'https://my.custom-api-url.com/something/';
}