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pragma solidity ^0.5;
contract Subscribe {
//Store customer accounts that have subscription
mapping(address => bool) public customers;
//Store customer count
uint private customerCount;
//Subscribe event
event subscribedEvent (address indexed _customerId);
constructor() public {
customerCount = 0;
function getSubscriptionStatus(address _customerId) public view returns(bool) {
if (customers[_customerId]) {
return true;
} else {
return false;
function getCustomerCount() public view returns(uint){
return customerCount;
function performSubscription() public returns(bool sufficient){
//Require that customer haven't subscribed yet
if(customers[msg.sender]) return false;
customerCount++ ;
customers[msg.sender] = true;
emit subscribedEvent(msg.sender);
return true;
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