You can add the Require Membership metabox to any WordPress Custom Post Type. Straight out of the box, SPMS will add this metabox to the following Custom Post Types:
- Post
- Page
- Products (WooCommerce)
Additionally, it will not allow you to add the metabox to CPTs that make no sense. So, the following are not even shown to you:
- Attachment
- Revision
- Navigation Menu Item
- Orders (WooCommerce)
- Refunds (WooCommerce)
- Coupons (WooCommerce)
- Product Variation (WooCommerce)
- Plugins
- Plugin Groups
- Forum (bbPress)
- Topic (bbPress)
- Reply (bbPress)
To enable the Require Membership metabox on any other WordPress Custom Post Type:
- Go to wp-admin->Settings->SPMS CPTs
- Click the CPT you would like to enable (use the CTRL-CLICK combination to select more than one)
- Select the page you would like to redirect the user to if they do NOT have the proper membership
- Click the Save Settings button.

More Topics In Member Subscriptions - Components