Hi @andregonzalez ,
You can absolutely updates through the web forms. This is one of their main purposes.
But the real question is about security !
Of course, the datas MUST be secured and impossible to guess outside the platform. For this purpose, ACC offer encrypt mecanism. By this way, you encrypt the recipient id in the sent message, "impossible" to decrypt externally (because it uses internal key). When recipient click the link, the plateform decrypt the id with the built-in functionnality and retrives the recipient's informations. At this point, you can add forms, and finally a save activity in the web form workflow.
Cedric