Hello i wanna know what i need to do, i’m searching for a long time how to do the next import './TokenERC20'; // contract A contract Testing { // contract B function buyItem ( address _to , uint _itemPrice ) public { // Require Metamask alert saying "Token + gas" // Use a tokenTransf…

Hi @kypanz , With ERC20, if we transfer an amount of tokens to a contracts address, the contract has no way of knowing that this occurred. Instead we first need to approve an allowance for the recipient contract, then in a second transaction, a function we call in the contract can call transferFrom.…

Hi @kypanz , In this case, we need to use transferFrom rather than transfer. When an ERC20 token holder interacts with another contract using the token, two transactions are required: The token holder calls approve to set an allowance of tokens that the contract can use. (assuming an OpenZeppelin…

[image] abcoathup: transferFrom(address sender, address recipient, uint256 amount) public returns (bool) @abcoathup thanks for the answer , im trying this now : pragma solidity ^0.5.0; pragma experimental ABIEncoderV2; import "./ERC20Detailed.sol"; import './ERC20.sol'; contract TESTING i…

Hi @kypanz , The token holder needs to call approve first, in a separate transaction on the token contract to set an allowance of tokens that the contract can use. The Testing contract has an allowance of zero currently which is why this fails. I can put together an example tomorrow if you need.

Yess please, if you can , i wanna understand what i doing wrong , thanks again

Hi @kypanz , Did the above example make sense? Let me know if you have questions.

hello, Im facing the gas estimation issue. Below is the code: Im facing issue regarding GAS ESTIMATION ERROR. While transfer Token to address. It Works Fine when i transfer token from wallet but in code it throws error. Code Below: // SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import …

How to use a token transfer function into another function ? [ ERC20 ]

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How to use a token transfer function into another function ? [ ERC20 ]

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