We support pulling up to 15 Custom Fields today in each Contact record in both the individual Contact API (http://developer.constantcontact.com/docs/contacts-api/contacts-resource.html) and the Bulk Export API (http://developer.constantcontact.com/docs/bulk_activities_api/bulk-activities-export-contacts.html). If the account has been upgraded to our new Contact Management system (majority of accounts are and we are closing on 100% soon), the label will be set to what the field is named as well. If they are on our older Contact Management system, which is unlikely at this point, they will not have the label available. We will be expanding this to unlimited custom fields in a future update but do not have a planned date for that today.
Today we do not support a SSO solution for logging directly into Constant Contact from a 3rd party solution. We are rolling out a SAML 2.0 SSO solution for partners soon and, if you're interested, you would need to join our technology partner program to get access to that feature. Even with that feature, we do not currently support deep linking.
We do support pulling all tracking and analytics for every Email Campaign (http://developer.constantcontact.com/docs/campaign-tracking/email-campaign-tracking-.html) and for every Contact (http://developer.constantcontact.com/docs/contact-tracking/contact-tracking-all-activities-api.html)
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