I do not use this, but having had a quick look at their T&C it woud seem that these are only redeemable in Play Store https://support.google.com/opinionrewards/answer/6322284?hl=en#zippy=%2Chow-do-i-redeem-my-google-play-credits%2Cwhat-can-i-redeem-my-credits-for-in-the-google-play-store I suppose i...