How can I give an existing subscriber a lower price?

How can I ensure a customer with an existing subscription continues to be charged the original price after I mistakenly increased the price for all subscribers in bulk?

To give one subscriber a lower price, you can create a discount code in Shopify and apply it to that customer's subscription within the Subscriptions admin. This discount will apply to all future orders for that subscription, without the need to manually add it each month.