[SC] Implement Content Delivery System for Completed Purchases

[Pvsaint]

Description:

The contract records purchases but lacks functionality for delivering content or granting access to purchased content. Implement comprehensive content delivery system that manages access control, subscription models, and various content access patterns based on successful purchases.

Acceptance Criteria:

Create access token/key generation for purchased content
Implement access control checking based on purchase records
Add time-based access controls and expiration mechanisms
Support multiple access models (one-time, subscription, time-limited)
Create subscription plan management with recurring payment tracking
Implement subscription state management (active, canceled, expired)
Add subscription renewal and upgrade/downgrade capabilities
Support content license management

Technical Details:

Consider implementing access NFT or token-gated system
Add mapping between user addresses and accessible content IDs
Create time-based access control for subscriptions
Implement subscription period tracking and automatic renewal
Add grace period handling for failed subscription payments
Create proration system for subscription changes
Add events for content access granted/revoked and subscription changes
Implement multi-step verification process for content access

[GoSTEAN]

Can i work on this, i wam a smart contract developer

[emarc99]

Is this issue still available. As a recent OD fellow, would love to do this.