Step 4. Create a quote

When a customer adds an item to their shopping cart for the first time, Adobe Commerce creates a quote. Commerce uses a quote to perform tasks such as

Track each item the customer wants to buy, including the quantity and base cost
Gather information about the customer, including billing and shipping addresses
Determine shipping costs
Calculate the subtotal, add costs (shipping fees, taxes, etc.) and apply coupons to determine the grand total
Determine the payment method
Place the order so that the merchant can fulfill it.

Types of carts

Commerce identifies three types of users that can create a shopping cart:

An admin user can create a cart on behalf of a customer. For all admin requests, you must provide an admin authorization token in the call's authorization header.
A logged-in customer. Calls to create a cart and add items must contain the customer's authorization token in the authorization header.
A guest user. These users could be customers who haven't logged in yet, or they could be users who have no intention of creating an account. An anonymous user's cart is called a guest cart.

Create a cart for a logged-in customer

All calls for a logged in customer must specify customer's token q0u66k8h42yaevtchv09uyy3y9gaj2ap in the header.

Use the V1/guest-carts endpoint to create a cart on behalf of a guest. Do not include an authorization token. The quoteId for the guest customer quote will be masked.

Endpoint:

POST <host>/rest/<store_code>/V1/carts/mine

Headers:

Content-Type: application/json

Authorization: Bearer <customer token>

Payload:

None

Response:

The response is the quoteId: 4

Some calls refer to this parameter as the cartId.