I have a similar question regarding QuickBooks Desktop Enterprise. We invoice our customers through QuickBooks. So our invoices are generated prior to a credit card payment being received. We recently switched from QuickBooks POS to Square and the payments are being deposited just fine. However, how do you post a Square credit card payment to an existing invoice in Desktop Enterprise? I've tried contacting Square and they asked me to contact QuickBooks Support. When I contact QuickBooks Support, they can only link me to information about QuickBooks Online and suggest I contact Square. Can anyone here help me?