How to dinamically display payment date and add specific dates to it?

I’m trying to build a payment timeline for a product, some sort of an installment timeline. 

I need to do this automatically, so when the user enters the Thank you funnel, they receive an email showing a payment timeline. 

e.x.

The due date needs to be the placed order date + 30 days for the first installment, and  the placed order date +60 days for the second installment. The placed order is the first time they opted for the service. 

I tried using different variables, but none displayed the placed order date and function properly. Something I used but this is relative to the date I send the email not the date someone placed the order  

{% today '%Y-%m-%d' as today %} {{ today|days_later:60|format_date_string|date:'M d' }} 

Is there a variable structure that I am missing?