Bulk Data Insertion API - User Agent?

I've experienced a downtime in purchase tracking in analytics on my website due to a bug in a release, and I've been looking at solutions to recover the data that was missing during the tracking downtime. I was still tracking most of the information on my purchase page, but did not track the specific purchase event.

I've had a look and it looks like I can use the bulk data insertion API to add the missed bookings back in, as I was still tracking purchase ID I will be inserting in the correct amount, and I can retrieve the rest of the details of the booking from other sources.

My only question is, in the BDIAPI's required fields, it states that userAgent is required. I can get the rest of the fields from a data warehouse extract, but I was not tracking user agent so that information is lost - what is the purpose of user agent in this insertion? Would there be any issues introduced if I just used the same user agent for all uploads, as I only want to use this to set the purchase event?

Thanks in advance