More in-depth diagram

1. Subscriber makes a content request to CPA
2. CPA checks with CP regarding request validity
   • Invalid request: CPA passes CP's report to the subscriber
3. CPA sends a confirmation code to subscriber
4. Subscriber sends the code to CPA
   • Incorrect code: CPA sends a note to subscriber (can retry)
5. CPA makes the content request to CP
6. CP sends the content to CPA
7. CPA sends the content to subscriber
8. CPA sends the delivery report to CP