Research on claim rewards

[saumyakaran]

TODO

🎯   What is the problem that needs to be solved?

🗒   Summary

We need to allow user to claim rewards on the frontend using payoutStakers(validator_stash: AccountId, era: EraIndex). The idea is to provide the data about unclaimed rewards needed to make the claims from the backend.

✅   Outcomes

• Data for unclaimed rewards provided via API (eraIndex for unclaimed rewards)

⏳   ETA

ETA not updated yet.

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Refer: ETA culture document