Development request: Warehouse management APP - collection from warehouse signature

We are trying to decrease our paper use in the company and so are trying to implement the use of the WMS APP to pick our orders and record the outgoing batch numbers for orders.
Previously, if an order was collected at the warehouse, we asked the customer to sign a packing list that the items were received 
It would be great if there could be a signature capture on the app for when orders are collected. This would help in the situations that staff of companies collect direct from us.