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.
TBD: List all of information to be removed in details.
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).