Customize Constant Contact Add On To Send Birthdate

We have the GF Constant contact add on which syncs the form fields to our constant contact list.
We need to adjust the add on to allow for the constant contact default birthday field to be included in the sync process.
Currently constant contact’s birthday field is not able to be synced with the add on plugin. We can only send it to a custom field but we need it being pushed to the actual built in birthday field in constant contact.

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