What's the difference between subscription discounts and discount codes created in Shopify?
Subscription discounts are configured within your subscription group settings and automatically applied to orders. Discount codes are created in your Shopify admin and can be added in the checkout or customer portal. Shopify discount codes can be used alone or together with subscription group discounts.
Read more about how to set up subscription discounts when creating your subscription group here: https://support.boldcommerce.com/hc/en-us/articles/360051203791
Read more about using Shopify discount codes with subscriptions here: https://support.boldcommerce.com/hc/en-us/articles/11369207621012