Is there an app or program that helps with invoicing/billing?

Keep Records, Keep following up & put notification alerts a day before the promised delivery of your payment in your calendar app to call the broker or shipper to get an update...These threads are very resourceful, it's seems 60-90days pay is the norm & that reserves is a crucial aspect of being an O/O unless you offer % to work under another authority that pays your at the end of the week - (You have to get more features offered than just factoring - maybe throw in a free trailers & than some to give away hard earned spinach) - popeye's money makes you stronger