Add transactional data to contact

This operation adds a single piece of transactional/insight data to a contact or account.

This operation can be used to add a single piece of account insight data, in which case the contact identifier used must be account

Please note that valid transactional data collection names must be unique, even if the collections are differently scoped (e.g. one collection is contact-scoped and another collection is account-scoped (AccountInsight)).

Collection names can only contain alphanumeric characters (A-Z, a-z, 0-9), and underscores ( _ ), they can't start with a number, exceed 255 characters in length, or contain spaces.