I have this function (is a SC implementing and auction):

/// @notice Register a new participant
/// @param _preferences agent' preferences
function regAgent(uint[] memory _preferences) notOwner onlyBeforeEnd public {
    require(msg.sender.balance - fee >= 0, "You can't pay the fee.");
    require(!registered[msg.sender], "Agent is already registered.");
    Agent memory newAgent = Agent(agents.length, msg.sender, _preferences);
    registered[msg.sender] = true;
    // 1. the agent must pay the fee to participate
    // 2. owner must recieve that fee

But I don't know how to do the last part: a participant have to pay a fee to the owner (the entity who deployed the SC). So I'd like to transfer ether from participant' address to owner address. That's all.

Any advice is welcome.

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