The order files have the following structure of the file name duriing import (=single order):
At the export to the merchant, all orders that were not exported yet at the time of the export are concatenated into an order list. The file name is then:
The definition of the time stamp is free but it is recommended to use the following structure: YearMonthDay_HourMinuteSecond (i.e.: "20110812_124301"). During export, this format is automatically provided.