Creating a product under a specific sales channel

The API documentation don’t seem to help with each use case.

For example, I’m trying to integrate with my unsupported sales channel ( And it’s extremely difficult due to the lack of documentation. At the moment, I’m able to create the product through ( that triggers a web hook and creates a product on Veeqo, but I need this product to be created under the sales channel that corresponds to (

Also, in the advanced options under our direct sales channel for ( I don’t see the same advanced options that are shown under native sales channels such as eBay and Amazon. I need the option to link the listings by SKU by default.