Couple things to keep in mind:
- You should only have one application that integrates with the Ads API. That single app can make requests for multiple ads accounts.
- Your app can’t make Ads API requests for an ad account unless the owner of that ad account authorizes your app using the approaches previously mentioned.
I Assume both game A and game B have their own Twitter account and ad account. If you can’t access game B’s account or ask the owner of game B to authorize your app, you will not be able access that account.
Is there a dashboard for us to configure the account access ?
If you log into ads.twitter.com with Game B’s account, go to the top-right menu and select “edit access to account”. You can then add the user account for Game A which will allow Game A to manage Game B’s ad account. Again, you will still need access to Game B’s account to do this.