Change domain in this php code (noob question)

Hi this code generated a URL using my website domain:

'link' => str_replace('&', '&', $this->url->link('product/product', 'product_id=' . $result['product_id'] . '&tracking=' . $tracking))

How can I make the code above generated a URL with a specific domain, say: and NOT use my websites domain?

Thank for any help

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