Subi gives your store two customer portals, and both work out of the box:
Subi portal: a hosted page at portal.subi.co. Customers log in with a one-time code. Ready to use, nothing to set up.
Shopify customer account: customers manage their subscriptions inside their own Shopify account. This is the most seamless experience, and it needs a one-time setup (adding an app extension).
The Portal page lets you see both, and choose which one the links in your subscription emails open. To get there, open Storefront & Portal and click Manage portal on the Customer portal tile.
View and share your portals
The first card on the page, Where customers manage subscriptions, shows both portals side by side, each with a small preview of your portal as your customers see it.
On the Subi portal tile, you'll see the portal link with two buttons: Copy (copies the link) and Preview (opens the portal in a new tab).
On the Shopify customer account tile, you'll see Add Shopify extension (which opens your theme editor so you can add the extension) and Setup guide (a short video walking you through the setup). Once Shopify reports the extension is on, the tile shows an Added badge.
The portal your emails link to carries an In emails badge.
Both portals share the same look and texts. To change them, click Customize portal at the top right of the card, or click either portal's preview. What you set there applies to both.
Choose the portal your email links open
At the bottom of the same card, Portal in subscription emails names the portal the links in your subscription emails open today. To change it:
Click Edit.
Pick Subi portal (the default, always available) or Shopify customer account. If you pick the Shopify customer account and the extension isn't added yet, you'll see a reminder with an Add Shopify extension button: add it first, otherwise customers who open the link may not see their subscriptions.
Click Save. The window closes and you'll see a short confirmation. Nothing changes until you save, and Cancel keeps your current choice.
If the Shopify customer account option is locked
Your customers can manage their subscriptions in their Shopify customer account on every Subi plan, once the extension is added. What your plan decides is whether the links in your subscription emails can open it. That choice comes with the Subi and Subi Plus plans, and on other paid plans, such as Starter, it can be added on its own as the Embedded customer portal (white-label) add-on. Add-ons are not available on the Free plan. The add-on uses this same customer account extension, so adding it changes nothing in a setup you already have. If your plan doesn't include it, the Shopify customer account tile shows a lock badge and the option can't be picked in the Edit window. Your email links then open the Subi portal, and you can upgrade or add the add-on to link them to the Shopify customer account.
Where to see the email link
Next to Edit, View email takes you to your email notification settings, where you can see where the link appears.
To check the link itself, open Edit again after saving. Under Check it in an email, View email shows the Subscription activated email with the link your customers will open, and Send test email sends that email to your Recipient email (your shop owner email, unless you changed it in your email notification settings). Both work once your choice is saved.