I used to have my credit card payments handled through Authorize.net.  I do school photography and make 50-100 sales on the spot.  However, I only take the credit card into down on their orders forms.  Then I run all the credit cards at once via a batch transaction on the Authorize.net website.  I would put all my details in a spreadsheet and save as a .csv or .txt file.  Then i would upload in the website portal and instantly all transactions would be approved.  How do i accomplish this through Square?  I don't want to have to hand key 50-100 transactions.