I am trying to integrate squareup subscription system in my MERN application.
In this app:
The products are dynamic - added from admin panel
The prices of the products can change overtime - need to charge new price after current cycle.
I am not able to find any clear documentation and any blogpost or video to do the above.
If you need to change the price of a subscription you’ll have to update the order_templet_id on the subscription. 
Thanks for guiding in this direction. But our problem is we are not able to figure out any api documentation to guied me how to implement subscription based pricing. I mean which api to call what all parameters to pass etc…
Also one of the online link I searched, says we can not test subscriptions in test environment. If that’s the case how we will test our integration.
Our Subscriptions Documentation will walk you through creating a plan and creating the subscription.