Google Ads Conversion Tracking

Hi I am running Google Adwords to my theme in ThemeForest. Really appreciate if someone can advise on how to track conversion from Google ads to ThemeForest landing pages. Thank you so much!

Set up a different conversion action for each type of conversion that needs to be tracked. For example, set up one conversion action to track purchases of the website, and another to track calls from the ads. Multiple conversion actions for each conversion source can be set up.

Hi, thanks for your response but I want to ask for more details. For example, I just want to record Purchase on ThemeForest from Google ads, how to set it up? as I know, I can’t add any code or tag on ThemeForest’s website, right? So how I could record that conversion action?