Locksmith is an app that lets you control access to your products and collection pages on Shopify

We are often asked about secret sales, such as sales limited to members only, and the app we recommend for such occasions is Locksmith. It allows you to control access to products and collection pages in various ways, such as allowing access only to users with specified tags, passcodes, or specific URLs.

Locksmith

Access control for the Online Store channel. Lock any content; grant access with passcodes and more.

apps.shopify.com