Method to fetch current price

[idolize]

It would be helpful if the extpay SDK had some method to fetch the current price set so I can display it on the "upsell" screen before I actually send the user to the ExtPay payment page (as recommended in the docs - "It is best to open the payment page when the user has a clear idea of what they're paying for.").

Currently I have to hardcode this price value inside the code for my extension, and while I can tweak the value server-side on the ExtPay config panel, it requires submitting an entirely new build of the extension to the Chrome store to similarly update the price displayed on my own "upsell" screen.

(Example of current code required:)

// TODO pull this from a server
const price = '$3.99';

Having a way to fetch the price value from a single source of truth (ExtPay server) would be a simple fix for this issue.