I am testing the PayPal REST API for subscriptions in the sandbox environment, and have noticed that, when going to the approval URL returned after creating an agreement, no pri
Your observations are (currently) correct. As REST API based Billing Plans are based on Express Checkout Recurring Payments, you're going to see a similar behavior. Right now, there are two options:
Going forward, we're likely going to include this info in some later updates. I'm following up with that to make sure a user story is filed for this.