I'm using the Sendgrid PHP library and I want users to be able to unsubscribe when I send them emails using transactional email templates with Sendgrid.
When adding the "Unsubscribe" module in my template, then it looks all empty and without the unsubscribe link when I send it:
Is it possible to make the template display the right unsubscribe link?
Note I do not want to use the "Settings > Tracking > Subscription Tracking" option as that can't be added in the template and looks quite bad outside it.

