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If you want to have a plan that cannot be found on your storefront, you can now have secret plans that can only be accessed with a link.
Click on Memberships
Click on +New and choose a membership or pack depending on what you want.
Add the information, like with a regular membership or pack, but make sure to switch on the Secret plan toggle found under Availability.
Click Save and now go back to the Memberships / Packs page.
Find the option you just created, click on the 3 dots next to it, then Share.
You will see a popup menu, click Copy and you can now share this unique link.
Note: if you want to make an existing plan secret, you can just click on the 3 dots next to it, click Edit, and then follow the same steps above.