I just learned the existence of the M3 MI Data Import for Web Services (MDIWS), which is the equivalent of the traditional M3 Data Import (MDI) but using the M3 API REST/JSON endpoint instead of the traditional proprietary binary endpoint.
The tool and documentation are straightforward, so I will just promote it here with some screenshots:
Here are the executable and documentation:
Here is a sample semicolon separated CSV file with data, no header:
Here is the tool in action:
As a reference, here is the traditional M3 Data Import tool:
Thanks Björn P. for the tool.
That’s it!
M3 ideas 
Looks neat. Is it available on inforxtreme?
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Yes, it comes in the M3 API Toolkit, at the folder of the screenshot, and in Infor Xtreme the toolkit is called API Tools.
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NOTE: I forgot to mention this MDIWS tool is useful for when you are behind a firewall and the M3 API port is not available but the Infor Grid port is available (which it typically is for Infor Smart Office and Ming.le).
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