The tag ID is added in OneTrack already. You need to check in Pinterest Tag Helper, if you see the pixel can track Page view, View content, Add to cart, Checkout event, so the pixel is working well
Page Visit event: A pixel can track when a user loads a specific page on a website.
Add to cart: When a user adds an item to their shopping cart or basket, a pixel can be triggered to track this action.
Checkout: When a user successfully completes a purchase, a pixel associated with the tracking system is triggered in thank_you page.
Check the data in your Pinterest Event Manager
The data will be sent to your Pinterest Event Manager. Please check it in Event History
If you are still struggling with Pinterest Tag, please feel free to contact live chat support or onetrack.commerce@gmail.com for the best assistance.