I've no idea what you mean by climb the money. Based off your configuration their subscription will be active immediately for 2 days then Stripe will bill them 50 cents per month. The amount will not increase each month as such a feature in CBSubs does not exist. It will not ask them to pay unless they never completed the payment process for their basket (they still need to supply credit card information). If it asks them to pay after 2 days then you didn't use a recurring billing and just did a single payment.

For a 2 day free trial you'd use the below configuration. This has nothing to do with the payment gateway (Stripe).

Is the first amount and period different: Different first period and price for Registration only
First payment price of plan: 0
Initial validity duration: 2 days (48 hours)

Regular Price of plan: PRICE_HERE
Regular Validity duration: 2 months

There's nothing more you need to configure for a free trial. Note the above applies for new registrations only. If you want a free trial to also apply to already registered users you need to set the following.

Is the first amount and period different: Different first period and price for Registration and Upgrade

Ok, believe I see the issue. When using recurring payments the free trial isn't becoming active as the payment comes back from Stripe as Pending and gets treated as pending for the duration of the trial. Have added a bug ticket for further investigation and fixing.

#6911

Ok, have confirmed a fix for this and is pending review. New build should be available later today or tomorrow with the fix.