Server endpoint: http://localhost:3000/
- Return List of All Agents: GET http://localhost:3000/agents
- Add New Agent: POST http://localhost:3000/agents
- Retrieve all Agent Details by Agent's ID: GET http://localhost:3000/agents/:agentId
- Update Agent by ID: PUT http://localhost:3000/agents/:agentId
- List all customers associated with a given Agent's ID: GET http://localhost:3000/agents/:agentId/customers
- Add new customer: POST http://localhost:3000/agents/:agentId/customers
- Delete existing customer: DELETE http://localhost:3000/agents/:agentId/customers/:customerId
- Return all customer data from our system: GET http://localhost:3000/agents/:agentId/customers/:customerId
- Update customer: PUT http://localhost:3000/agents/:agentId/customers/:customerId