Would you mind telling me what task is it. What if i dont have coinbase, is it ok to use other wallet?
OP have described about the task at his post. It's clearly said above, haven't you read the post properly?
Its a app testing task. Its a new gaming app and not launched yet.
The task is to install the app , play a little bit and let me know whether google ads are displayed in the app.
That's all you need to do. And maybe he wants to pay the user through coinbase wallet to save the transaction fee. If you want it on other wallet he needs to pay some fee for tx. While coinbase to coinbase mail address transfer don't charge any fee.
