The Conversions API works with your Facebook Pixel to improve ad performance by sending events directly from your server to Facebook. Each server event is linked to a specific Pixel. To enable it, you’ll need to create an Access Token for your Pixel.
Steps:
Make sure you have admin access to Facebook Business Manager.
Log in to Facebook Events Manager.
Select the Pixel you want to use with Conversions API.
Go to Settings.
Under the Conversions API section, click Generate Access Token.
Copy the generated token and store it somewhere safe (it won’t be saved in Facebook).