John,
Hello. I have worked with Tax1099. They are a very large 1099 e-file company. There formats, Excel based, are all very easy and your Partner can quickly create a simple extension to them to produce the files. The files are emailed to them.
Attached are the file layouts and here is the link to there site: https://www.tax1099.com/
[View:/cfs-file/__key/communityserver-discussions-components-files/758/1099_5F00_MISC_5F00_DATA_5F00_IMPORT_5F00_2020-_2800_3_2900_.xlsx][View:/cfs-file/__key/communityserver-discussions-components-files/758/1099_5F00_INT_5F00_DATA_5F00_IMPORT_5F00_2020-_2800_1_2900_.xls] [View:/cfs-file/__key/communityserver-discussions-components-files/758/1099_5F00_NEC_5F00_DATA_5F00_IMPORT-_2800_2_2900_.xls]
Hope this helps.
Thanks,
Steve