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The details and more fields are found here: Contact import Format (Extended).
Describe here the key that identify the contact to be updated
PS: You need to specify the authorization and criterion you want to delete in that excel file.
...
The details and more fields are found here: Contact import Format (Extended).
Describe here the key that identify the contact to be updated
PS: You need to specify the authorization and criterion you want to delete in that excel file.