Prices that stay in step

A subscription line normally keeps the price it was created with, even after you change the product's price in Shopify, which can leave active subscriptions out of step with what new customers pay.
A new "Keep subscription prices in step with product prices" card, on Payment recovery and in billing settings, lists every product whose subscriptions sit behind today's price. For each one, you choose whether to move its subscriptions to the current price at their next order or leave them as they are, and save with a single button. The line's own percentage discount is kept and reapplied on top of the new price.
Subscribers aren't surprised by a rise: by default, Subi emails a subscriber before a price increase reaches a charge, naming the new price and giving a notice period you control (3, 7, or 14 days), and the increase never bills above or before what that email said. A price cut can apply immediately without an email, or you can turn emailing off entirely so only cuts ever apply. The email setting lives alongside your other customer notifications.
This is off by default; you turn it on from the card before anything moves.