Additional evidence might include copies of contracts with clients or customers (be conscious of privacy issues however), website material, corporate history, and so forth. (immigrationcanada.pro)
I get their e-mail while on the phone and then send them a signed PDF copy of a contract for them to sign and return by scanned PDF document. (biggerpockets.com)
You can get copies of the contracts I use along with videos that explain how to fill them out up in the right corner of the blog. (flipthiswholesaler.net)