How to create a redirect for portal url?
You can create a URL redirect in Shopify admin.
You can redirect yourstore.com/partners to your portal link.
Here are the steps:
1. From your Shopify admin, go to Online Store > Navigation.
2. Click URL Redirects.
3. Click Add URL redirect.
4. In Redirect from, enter the URL that you want to redirect visitors from. For example /partners.
5. In Redirect to, enter the new URL that you want to redirect visitors to. For example /apps/convertout/home for your portal.
6. Click add.
To learn more check out Shopify's help document on redirecting URLs: