Products

Set prices

$product->setAttributeValue('c_recupel',  new Magento2ProductWeeeTax($aboProduct['Recupel']));

Set inventory

Add product image

$magentoProductImage = $this->sendImageToMagento(BP . '/productimage.png');
$magentoProductImage->position = 2;
$magentoProductImages[] = $magentoProductImage;

$magentoProduct->setAttributeValue('image', $magentoProductImage->imageFile);
$magentoProduct->setAttributeValue('small_image', $magentoProductImage->imageFile);
$magentoProduct->setAttributeValue('thumbnail', $magentoProductImage->imageFile);

Link between products

Add product link

$product->addLink('12580', Magento2ProductLinkType::Related(), 15);

Remove product links

$product->clearLinks();