get https://region-api.dotdigital.com/v2/contacts//transactional-data/
Gets a list of up to 100 of the most recent transactional data records for a contact in a collection by their email address
This operation retrieves a list of transactional data pieces for a contact by a collection name.
However, it can only return a maximum of the 100 most recent pieces of transactional data stored against that contact.