I am familier with Amazon MWS and have used Report,Feed and Product API in past, now i want to upload TSV order file to ship all those orders in my amazon seller central's account. Please can anyone tell me what feed type should i use and what is the structure of the feed which i have to submit. Thank you in advance.
The FeedType for your request would be _POST_FLAT_FILE_FULFILLMENT_DATA_ for flat file submission.
You can find all FeedType values in this document: MWS Developer Guide (Version 2009-01-01) (Page 93)