Are you using Shopify at all?
If so, I think a better user experience would be to turn off the feature to sell a product when inventory is less than 0 and use the Klaviyo Back In Stock notifications tied to a flow instead of taking back orders.

Hey @Ming_LA 

@Akers Digital is 100% right, depending on your integration the best user experience would be to set up a back in stock flow. Here are the different help center articles you might need in order to accomplish this: 

• Install the Back in Stock Snippet for Shopify
• Install the Back in Stock Snippet for BigCommerce
• Set up Back in Stock for Magento 2
• Set up Back in Stock for Custom Catalog Feeds

Hope this helps!

OK thanks. Yeah I use Shopify, but I want to continue selling when out of stock but send customers an automated email. I’ll find some other solution.

Hi @Ming_LA

Out of curiosity, what would be the reason to keep selling if out stock? Are you able to re-stock quickly? 

Just asking in-case there’s a use-case I haven’t seen yet!

Cheers

Yup, pretty much what you said!

Hello, I have the same question. I want to create a post-purchase thank you email flow depending on whether the product variant is in stock or not. The solution of stopping sales when it’s out of stock doesn’t work, as I can restock very quickly. Thank you.