Returns the remaining balance of the tokens that the owner
authorized the spender
to send.
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curl -i -X GET \ -u <username>:<password> \ 'https://kip7-api.klaytnapi.com/v1/contract/{contract-address-or-alias}/account/{owner}/allowance/{spender}' \ -H 'x-chain-id: string'
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{- "balance": "0x10",
- "decimals": 8
}