This gist creates a membership card for new members, and distributes reward to each new member.

Membershi.sol

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

contract Membership {

    uint256 public totalAmount;

    uint8 public constant EARLY_MEMBER  = 10;
    uint8 public constant PRO_MEMBER  = 20;
    uint8 public constant ELITE_MEMBER  = 30;

    uint8 public constant EARLY_MEMBER_REWARD  = 10;
    uint8 public constant PRO_MEMBER_REWARD  = 20;
    uint8 public constant ELITE_MEMBER_REWARD  = 30;

    //struct membership data
    struct MembershipCard {
        uint8 membership_level;
        uint256 amount;
        uint256 membership_reward;
    }

    mapping(address => MembershipCard) members;

    // event for EVM logging
    event JoinedClub(address indexed newMember, uint256 indexed reward);    

    function joinClub(uint256 amount, address newMember) external {
        require(amount > 0, "insufficient amount to be a member");
        totalAmount += amount;
        uint256 reward;

        if(amount <= EARLY_MEMBER) {
            reward = (EARLY_MEMBER_REWARD * amount) / totalAmount;
            members[newMember] = MembershipCard (
                EARLY_MEMBER,
                amount, 
                reward
            );
        }

        if(amount <= PRO_MEMBER) {
            reward = (PRO_MEMBER_REWARD * amount) / totalAmount;
            members[newMember] = MembershipCard (
                EARLY_MEMBER,
                amount, 
                reward
            );
        }

        if(amount <= ELITE_MEMBER) {
            reward = (ELITE_MEMBER_REWARD * amount) / totalAmount;
            members[newMember] = MembershipCard (
                ELITE_MEMBER,
                amount, 
                reward
            );
        }

        emit JoinedClub(newMember, reward);
    }
}