I have just purchased a shopify store from the exchange. I have now taken over the facebook page, but I am unable to get access to previous ad campaigns and the facebook pixel data. Is it possible to transfer this over to me?
The easiest way to ask the current owner to assign the pixel to you. In order for them to do so, you'll need to send them your business manager ID and ask them to give you admin access. Once pixel access has been granted to your business manager, you should see it here: https://business.facebook.com/settings/pixels/
You'll then need to assign it to the person in your business manager who will be needing it (likely your media buyers!).
Last step - you'll need to connect it to the ad account that you want to run ads with by clicking on "Add Assets".