How does the Waitlist work?
When an item is sold out, your shopper will get the following 2 messages instead of a checkout link:
The top message can be customized in your WAITLIST tab. Your shopper needs to click on the "Notify Me" button in order to get messaged when the product becomes available again:
Commenters who opted into your waitlist get displayed on your WAITLIST tab:
And you'll be able to see the product that they're waitlisted for along with the variant options. In the case of the 1st user, their item came back in stock and so they were invoiced. In the case of the 2nd user, their item is still out of stock which is why the status is still 'Waitlisted' at the 'Back-in-stock date' field is empty.
Once your item's inventory becomes positive, back-in-stock messages immediately get sent to anyone on the waitlist.
The first customer(s) that got the back-in-stock message has a certain time to make the purchase. This time is determined by your back-in-stock hold time which you can change in your Waitlist tab:
Once that hold time expires, she falls off the waitlist and we message the next person who was on the waitlist for that item.
A couple notes to make this work smoothly:
1) You'll want the 'One-Time Notification' enabled on your Facebook Page (see this article)
2) You'll want to keep the defaults: "Track quantity" checked and "Continue selling when out of stock" unchecked: