Basic import
Currently, no support.
Extended import
The extended import gives the possibility to invalidate the selected contact, based on the contact number.
Applicable to contact which has no sales yet.
Target contact will be marked as ACCOUNT_DELETED and can't be login to ticketshop anymore.
Describe here the key that identify the contact to be updated
The details and more fields are found here: Contact import Format (Extended).
How to invalidate
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