• 'boxLeft' in px
• 'boxTop' in px
• 'boxWidth' in px
• 'boxHeight' in px

• uploadurl, externalSourceAuthHeader (for NextCloud integration)
• noAlert (so after 5 seconds no warning pop-up that you should look at your smartphone comes)
• showsecsend: the Safe Shipping should be shown afterwards
• siguploadurl  (may be redundant with uploadurl )

planned - not yet implemented

• fontSize (of the siganture box)
• dateString
• certificationLevel (as a sub-item to 'certify')

Example URL:

https://es.privasphere.com/pdfjs-2_4_456-es5-dist/web/#boxWidth=400&boxHeight=200&certify=1&embed_fonts=1

see also Signer Profile Export