Single Product Page as a Popup

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The question is slightly vague, so forgive a slightly vague answer…. but the way I would do this is by AJAX request.

  1. Click button – add event to listen for the request this would be frontend with Javascript / jQuery and would probably have a post_id to request attached to it.
  2. Load data – you could do this via the WordPress REST API or add your own endpoint function to return what you need via the established admin-ajax.php (you would be looking for the section titled “Ajax on the Viewer-Facing Side” and look into the wp_ajax_(action) hooks)
  3. Parse your data – load into your pop-up the data returned, making sure to add error handling to explain any issues / connection problems or unexpected data.

If I’m talking nonsense above, then you will need a plugin or some cash to pay someone who knows what they’re doing. It’s not a massive job though if you have a clear design of what you want and clear functionality steps spec’d out.