hmm... ok let me explain the concept of subscription products a bit.
On the app, A subscription or non-subscription products are set the same... (though in CF you cannot set a subscription as orderbump). But our app manages products/subscriptions same way CF stripe products does.
You want to have a product (subscription) + a one time fee order bump, then your setup will look something like this:
At the App:
You'll have two products, a subscription one, plus an order bump one (click the "set as order bump" button) to specify that the product is an order bump.
At CF 3rd Party Side:
You'll have two products as well.. The first one to track paypal subscription when bought alone, and the second product should combine both the product (subscription) + the order bump (when bought together), So whatever automation you have when people buy both the product + OB, that Paypal product's automation will be triggered.
What Your Customers Will See:
If your customers decide to buy the first subscription product alone, then they'll be charged starting from cycle period one the amount you set (or the trial, if you have any).
If your customers buy the subscription PLUS the order bump, then they'll be charged (the subscription price + order bump price) for the first billing cycle (week, month...etc) and then they'll be charged the regular amount afterwards.
P.S. As of the moment the app doesn't support having both a trial period + an order bump, but later one we can think of a way to implement that.
Hope that helps!