Question Wait for multiple UWR to be posted

Hello,

I have a claim reward system for a PVP quiz game. Once the match is finished the user claim his reward. Even if he's offline he can claim for all his pending rewards and I save them in a list of objects.

When he gets his connection back, I'd like to send all of them simultaneously, clear the list, if one of them failed it's added back into the list and know if one of them has failed.

Long story short, I'd like to know how I can yield return for a Coroutine that post several UWR.

Thanks a lot for your advices and tips