Using nvn_settings.cfg file:
Upload nvn_settings.cfg and nvn_extra_add.php file to server.
Apply setting (setting for extension is saved in nvn_settings.cfg as “Setting 1”)
Or use manual configuration.
1/ Upload extension – nvn_extra_add.php file into NVN Export Orders module.
2/ Add all needed fields (used in extension).
Be sure to add ID Order (Order No)
For simplify You can add all fields – extension ignore unused fields.