Please help with the explanation
You decide to order some pizzas by phone for a small pizza
You then decide to go to the local supermarket to get desserts and Refreshments. You give your Roommate (who is coming to the party) enough money to pay for the pizzas plus a tip after determining that the roommate will be home when the pizzas arrive.
Explain the steps to the overall P2P process and note carefully the critical information and the key Handoffs.