Bol
click 'bol.' and click 'next'
And login with your bol partner details. Click 'inloggen' and 'toestaan'.
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click 'change' and 'add property'
Select 'EXTERNAL_PRODUCTS_URL'.
Use the following setup. You can use this feed as basis, copy it to add your own products. You can also use for example Channable to create a feed directly from the library.