To create a contact identifier (CONTACT_ IDENTIFIER) for a CSV file you will need to create a randomly generated number.
For example, you could place 3006191 in cell A1 and then in cell A2, place the number that is one digit higher:
This number was randomly created by using the date (30-06-19) and then adding a 1 to the end.
If you highlight both and drag this down the CSV file, the whole column will fill with a number counting upwards for each cell:
How to import contacts into Zenu once I have successfully added the Contact Identifiers?
Go to Settings > Import Tools & Logs > Imports
Click on New Import, upload the file and click Next
The processor will then check each row and advise you if they will successfully import or not. If the row will fail, it will give you the reason why and the opportunity to fix the items prior to importing the file into your Zenu account
If you have a lot of errors, you may wish to delete the file in Zenu, then fix the errors in Excel and re-upload the file again
Upon re-uploading, the checker will re-check the file and you can fix any other remaining issues that have been flagged by the checker and then import the file