Hi,
I'm sorry but I don't know what they mean by "standard".
You can see here a list of the most common encodings:
en.wikipedia.org/wiki/Character_encoding..._character_encodings
None of them are called "standard".
And the most standard encoding is UTF8:
en.wikipedia.org/wiki/UTF-8
UTF-8 is by far the most common encoding for the World Wide Web, accounting for over 95% of all web pages, and up to 100% for some languages, as of 2020.
It's possible that what they mean is that they want the columns and their title to correspond to what their import tool wants. So other names, not all the columns, maybe a different format for some columns, etc. In that case, I'm afraid you won't be able to do that with a mass action. It will require a plugin to be developed specifically for their CSV format, like we developed in the past for Quickbooks as the software also required a specific CSV format :
www.hikashop.com/marketplace/product/216...port-by-obsidev.html