Saving Referrer Page

You can look at Daddy Analytics to capture a ton of user info, including their entire path through your site:
https://daddyanalytics.com

Or you can store the referrer (if the browser provides it in the HTTP header) in a hidden field using a PHP filter (see salesforce_w2l_field_value in Other Notes).

For example:

add_filter( 'salesforce_w2l_field_value', 'salesforce_w2l_field_value_referrer_example', 10, 3 );

function salesforce_w2l_field_value_referrer_example( $val, $field, $form ){

	$form_id = 1;
	$field_name = 'referrer';

	if( $form == $form_id && $field_name == $field ){
		if( isset( $_SERVER['HTTP_REFERER'] ) ){
			return $_SERVER['HTTP_REFERER'];
		}
	}

	return $val;

}

Note that you’d need to change the $form_id and $field_name to match your form and the field you want to store the referrer in.