API

Here’s a clean study table you can add to your guide.

REST Method	Purpose	Description	Common Usage Example
GET	Retrieve data	Used to request or fetch information from a server or API. Does not modify data.	Retrieve customer profile, chat history, ticket status
POST	Create / Send data	Used to submit new data to a server or trigger actions. Often creates new resources.	Start chat session, create ticket, authenticate user
PUT	Update existing data	Used to fully update or replace an existing resource.	Update customer information, modify interaction settings
PATCH	Partial update	Used to update only specific fields of an existing resource.	Change customer status, update phone number only
DELETE	Remove data	Used to delete a resource or remove information from the system.	Delete session, remove user, close/delete record
OPTIONS	Discover supported methods	Used to determine what operations an API endpoint supports. Often used in CORS/preflight checks.	Browser checking allowed API methods
HEAD	Retrieve headers only	Similar to GET but returns headers only, without response body. Useful for validation or testing.	Check if resource exists, validate API availability

Example REST API Calls

GET /api/customers/12345

Purpose: Retrieve customer information.

POST /api/chat/start

Purpose: Create/start a new chat session.

PUT /api/customer/12345

Purpose: Update full customer record.

PATCH /api/customer/12345

Purpose: Update only selected fields.

DELETE /api/session/12345

Purpose: Delete session or resource.

REST APIs allow systems to communicate using standard HTTP methods such as GET, POST, PUT, and DELETE to retrieve, create, update, or remove data.