OBN document transmission: Outbound PO and Inbound Invoice

Summary:

Hi,

We are trying to use OBN for Punchout document transmission i.e. Purchase Order Outbound from Fusion to OBN and Invoice Inbound from OBN to Fusion.

Are these documents transmitted automatically (something similar like PO PDF email trigger) ?
OR

Do we need to set up the document transmission separately? NOTE: I am aware about the B2B messaging setup on supplier site and will perform that task.

Do we need to customize the Purchase Order data model making it compatible to OBN?

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