You can integrate JVZoo into your PHP site by using their API. First, you need to create a JVZoo account. You can find your API keys in the JVZoo dashboard. You should copy the API keys. After that, you must include the JVZoo PHP SDK on your site. You can download it from the official JVZoo site. Next, you will need to set up a script to interact with the JVZoo API. You can use the API to handle product sales and affiliate commissions. You should test the integration to ensure it works properly.