pub struct HandleFees;

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impl OnUnbalanced<Imbalance<<Pallet<Runtime> as Inspect<<<MultiSignature as Verify>::Signer as IdentifyAccount>::AccountId>>::Balance, <Pallet<Runtime> as Balanced<<<MultiSignature as Verify>::Signer as IdentifyAccount>::AccountId>>::OnDropCredit, <Pallet<Runtime> as Balanced<<<MultiSignature as Verify>::Signer as IdentifyAccount>::AccountId>>::OnDropDebt>> for HandleFees

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fn on_nonzero_unbalanced(amount: Credit<AccountId, Balances>)

Actually handle a non-zero imbalance. You probably want to implement this rather than on_unbalanced.
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fn on_unbalanceds<B>(amounts: impl Iterator<Item = Imbalance>)
where Imbalance: Imbalance<B>,

Handler for some imbalances. The different imbalances might have different origins or meanings, dependent on the context. Will default to simply calling on_unbalanced for all of them. Infallible.
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fn on_unbalanced(amount: Imbalance)

Handler for some imbalance. Infallible.

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