Sending External Invoices Workflow

We're building an integration to send external invoices through the Financial Edge NXT system from our purchase ordering platform. It appears that we need to create a purchase order and then send line items associated with that purchase order that include product ids. We're running into an issue because the product id's for our products do not exist and I don't see an endpoint for creating new product id's. Has anyone dealt with something similar to this?

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