Can anyone recommend a pre-order app compatible with the Shopify buy button?

[nosmh]

I have a client with a wordpress based site that we are using to promote their product. We would like to take pre-orders but we are using the Shopify buy button embedded in the WP site. 

Does anyone have a pre-order app that will work correctly with the shopify button sales channel?

Thanks.

[WEllis84]

Hey Joe aka NOSMH - I am running into the same issue. Did you ever get the answer to your question? Or figure it out?