Imaging you can get a signature from a client who pays your invoices: you ask for a full name and to write a signature before clicking
Pay button. This Add-on makes your imagination come true.
Payers sign invoices directly in a browser by drawing a signature with their mouses or finger (if on mobile or tablet). After payment signature appears on invoice receipt page and on edit invoice page as well in a specific metabox.
Download and install Add-on like a normal WordPress Plugin. Here is the Instructions.
Once plugin is installed and activated you'll notice the new option in Payment settings of each invoice (Not for manual Payments):
Clients will see the following inputs for a signature. It is required to fill Name and draw a signature otherwise payment will be declined.
After payment signature information appears on back-end on edit invoice page: