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i am able to send eth (with a payable function ) to the my contract but what i really need is that when the user interact with the contract it takes a specific amount on the msg sender and add it to its balance.

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  • A contract cannot withdraw ether from other addresses. It can only withdraw from its own balance. You can achieve something similar using ERC20 function transferFrom. See this answer ethereum.stackexchange.com/a/46458 to learn how to use it.
    – Ismael ♦
    May 17, 2022 at 6:58

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The sender must attach the required amount of ETH to the transaction.

mywallet.sendTransaction({to: contractAddress, value: "1000000000"})

Contract will then be receiving this amount as part of the transaction.

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  • so if i understand i do msg.sender.sendTransaction({to: contractAddress, value: "1000000000"}) do i need to import any library for this function sendTransaction ?
    – dev
    May 16, 2022 at 7:21
  • No, that's just an example of how to send value to a contract.
    – Kof
    May 16, 2022 at 7:22
  • but how should i define that sendTransaction function ?
    – dev
    May 16, 2022 at 7:26

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