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Quick answers to the questions merchants ask most. Each links to the full guide.

Pre-order

Set an Oversell limit on the variant. Bloom stops accepting pre-orders once that many are placed, so inventory only goes as far negative as you allow. See Configure a pre-order product.
No. Bloom charges the full price at checkout - it doesn’t take deposits, split payments, or charge-later. The pre-order is a normal Shopify order, paid in full now.
Yes. Leave Shopify’s split shipping off and the whole order ships together once every item is ready. Turn it on and in-stock items ship now while pre-order items follow. See Split orders.
Update the ship message in Bloom - the order note and the customer’s order status page update. Updates are sent to Shopify & Klaviyo to trigger comms. See Updating pre-order info on existing orders.
Yes. When inventory goes back above zero, the variant sells normally again - no need to disable anything. See the Pre-order overview.

Notify Me

Yes. When the variant restocks, Klaviyo triggers your back-in-stock flow and sends the alerts. You control the timing and channels in the flow. See Set up the back-in-stock flow.
Yes - sign-ups are stored in Klaviyo, not in Bloom, as back-in-stock subscriptions. See Connect Klaviyo and Notify Me sign-ups in Klaviyo.
Yes. Klaviyo sends both - you pick the channels in your flow. SMS only reaches subscribers in Klaviyo’s supported countries. See Notify Me overview.
Notify Me sends nothing until you’ve created the back-in-stock flow. Sign-ups are captured when you Connect Klaviyo.

General

Pre-order sells a variant before stock arrives - the customer pays now. Notify Me captures interest on a sold-out variant and emails the shopper when it returns - no sale until then. See the Pre-order and Notify Me overviews.
By default it shows both. You can turn on Hide notify me if product on pre-order in Notify Me settings.
No. Notify Me only captures interest - it doesn’t hold stock, and signing up doesn’t guarantee the shopper gets one. To let customers buy ahead of stock, use pre-order instead.