[Closed] Wordpress help please - fill in pdf online secure save and sign

Dear STW WP experts,

I run a site where our customers download a pdf print it out then send it back to us. I want the customer to be able to fill the pdf online in a secure client area hosted on our site, saving it for completion later on if required, sign it with docusign or similar and then send it to us electronically. Additionally I want to be able to send automated emails to customers to prompt them gently to finish completing the form.

Thus far i have developed our website using plugins etc myself and it works ok. But i'm struggling to find a plugin or workflow to achieve the above. I've looked at web merge, pdf filler, adobe, wp-client.

Any ideas greatly appreciated.