Cart Timeout on Pricing Change
Zyla API Hub has no shopping cart. There is no shopping cart.
To subscribe, open the API, go to the Pricing tab, and choose the plan. That opens Stripe Checkout using the plan price at that moment.
The site does not set a checkout expiry, and it does not define what happens if the price changes while Checkout is already open. Prices can change.
Start checkout again from the Pricing tab to pay the price shown there.