how to mass update AR cust site "statement preferred delivery method" and "preferredcontact method"

Summary:

how to mass update AR cust site "statement preferred delivery method" and "preferred contact method"

as all set to "Print" and means dunning letters are going to the check printer!

had a look in "uploadcustomerstemplate" fbdi template but can't see those columns there (even unhidden all columns)

had a look at the rest api's and can't see one there either

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25D

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