I need customers to sign at time of sale - any plugins or solutions?

We have a rural store and we need customers who put items on account to be able to sign something to say they have taken the goods. Does anyone use an ipad to get customers to sign for goods?  Does it connect somehow to MYOB?  Or how does the information (signature and customer details) get stored?  Any assistance would be greatly appreciated. 

We use Account Right Plus.