Change data value within alert email
Dear all,
I am struggeling with the following situation / scenario:
I'd like to setup a program where users can download a PDF on my website by filling out a form. But before they get the download link by email, I would like approve/disapprove them.
1) User fills out the form on my website (name, emailadress, phone)
2) Sales owner get an alert email with prospect information and two buttons: approve or disapprove
3) After approval through the sales owner the prospect get the email that includes the download link
I created the custom field "lead.datadownload". If this field stores the value "true" the user can receive the email with the download link.
Where I am struggling right now:
If you click the "approve" button/link in the alert email how can I you update the custom field "lead.datadownload" of the prospect?

Many thanks in advance for any hints!
have a nice day