You can use the generate() special function to generate new CustomerCard identifiers. When you enter this function in customerCard:{index} Excel column(s) and import the Excel file into the Back Office, the system will create random values for CustomerCard identifiers.
The generate() function may only be used for
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new customers you create with the Excel import function, or
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existing customers who do not yet have other CustomerCard identifiers.
Otherwise, the function will be ignored.