You can either use a standard form for your client to fax you their bank data and authorization or have them fax a void copy of their check for their consent. When you get the fax, you have reasoned made agree to make a draft of their check.
After you get a check by fax from your client, using OnlineCheckWriter.Com, please enter the data, print it by any printer you have at home or office on Blank Check Paper, and make a draft of the check, with no signature required. All you have to make sure of proper authorization and keep a record of it.
OnlineCheckWriter.Com will print a draft that you would then need to Deposit into any U.S. bank. The draft will be treated like a check you get via the post office or over the counter. Endorse the back of the check draft printed, and make your Deposit.