Using the Snapchat Pixel Helper, you can check whether the events are being tracked appropriately. Here is the link for it: Snapchat Pixel Helper

You can use our Snapchat Pixel for Magento 2 Extension to add Snapchat Pixel in your Magento 2 store.

Read this guide on How to Add Snapchat Pixel to Magento 2 to add Snapchat pixel to Magento 2 using this extension.