SubscriptionManager

Git Source

Allows a vendor to periodically charge subscribers for a subscription service.

State Variables

token

IERC20 public token;

vendor

address public vendor;

subscriptionFee

uint256 public subscriptionFee;

nextPaymentDue

Mapping of subscriber address to next payment due timestamp.

mapping(address => uint256) public nextPaymentDue;

isSubscribed

Mapping to track subscription status.

mapping(address => bool) public isSubscribed;

Functions

onlyVendor

Modifier to restrict function access to the vendor.

modifier onlyVendor();

constructor

constructor(IERC20 _token, uint256 _subscriptionFee);

Parameters

Name	Type	Description
_token	IERC20	The ERC20 token address for subscription payments.
_subscriptionFee	uint256	Fee per period (in token smallest units).

subscribe

Called by a user to initialize their subscription.

function subscribe() external;

chargeSubscriber

Called by the vendor to charge a subscriber.

function chargeSubscriber(address subscriber) external onlyVendor;

Parameters

Name	Type	Description
subscriber	address	The address of the subscriber to be charged.

setSubscriptionFee

Utility function for vendor to update the subscription fee.

function setSubscriptionFee(uint256 newFee) external onlyVendor;

Parameters

Name	Type	Description
newFee	uint256	New fee per period.

unsubscribe

Called by a user to unsubscribe from the subscription.

function unsubscribe() external;

Events

Subscribed

Emitted when a subscriber is initially enrolled.

event Subscribed(address indexed subscriber, uint256 nextDue);

Charged

Emitted when a subscriber is charged.

event Charged(address indexed subscriber, uint256 amount, uint256 newNextDue);