I need to create a Form (JetFormBuilder) with the option for three people to sign the form. The process should be like this.

1. The user uploads a image to a form (or other function/custom code) 

2. The user adds three email addresses. 

3, The form send mail to the three users to sign the image. Each user will get a link to a form with the image and the signature

4. When all users have signed the image a pdf will be created with the Image and the three signatures. 

I'm not sure how to keep track of the signatures but I think we need a separate DB table or anything similar. Whe automatic creation of the PDF probably need to be handled by a check-script in a cron function or similar. Architectual suggestions are welcome :) 

I also need a uniq url for the PDF results. I was thinking that I can reuse the signatures uniq nounce or similar. 

I got the idea now when there is a signature addon to the JetFormBuilder.