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I am writing a sort of staking contract, where people can stake my ERC20 token, and get rewarded in the same token.

My contract is working with 2 address.

  1. Stake address - where I put all the staked tokens
  2. Reward address - where I put the tokens to be used as a reward.

When users claim the reward, the contract calls transferFrom(rewardAddress, userAddress, reward)

I'd like to know how I can possible arrange my reward address to grant unlimited allowance/approval for the contract to spend its tokens. Is there a standard/best practice for this? Do I have to manually set an allowance behind the scenes?

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