e-signatures for quote confirmation

[pfrunzio]

[benjamin-antupit]

• Actual signature collection:
  • Write-in and simple demo: https://github.com/thread-pond/signature-pad
  • Signature looks pretty: https://github.com/szimek/signature_pad
• Render signature onto PDF and save with existing PDF library xhtml2pdf
• Save signed PDFs to server, display in list. Make available to client and exec.