Changed price updates to apply to new subscribers only
When a provider changes a strategy's price, the new price applies to new subscribers only. You keep yours: on your account cards, when you add an account to the same strategy, and when you resume a cancellation you had scheduled. At payment, you are always charged the price you saw; if it changed in the meantime, the screen asks you to confirm the new one first, and your promo code is kept through the whole payment, whatever the payment method.