UCP Middleware - Complete Checkout Test Console

Step 1: Discover UCP Capabilities

GET /.well-known/ucp

AI agents call this endpoint to discover what shopping capabilities are available.

Response

Step 2: Create Checkout Session

POST /checkout-sessions

Creates a cart and adds products. Returns cart ID and subtotal.

Product Information

Product SKU

Product Title

Quantity

Buyer Information

First Name

Last Name

Email

Cart ID:

Response

Step 3: Set Shipping Address & Get Methods

POST /checkout-sessions/:id/shipping-methods

Provide shipping address to get available shipping methods with prices.

Shipping Address

First Name

Last Name

Street Address

City

State/Region

Region ID

Postal Code

Country

Phone

Response

Step 4: Select Shipping Method

PUT /checkout-sessions/:id/shipping

Select a shipping method and confirm the shipping address.

Available Shipping Methods

Response

Step 5: Apply Discount (Optional)

PUT /checkout-sessions/:id

Apply a coupon code to get a discount on the order.

Coupon Code

Response

Step 6: Select Payment Method

PUT /checkout-sessions/:id/payment

Choose how you want to pay for the order.

Available Payment Methods

Response

Step 7: Place Order

POST /checkout-sessions/:id/complete

Complete the checkout and place the order.

Final Order Summary

Complete previous steps to see order summary

UCP Middleware - Complete Checkout

Step 1: Discover UCP Capabilities

Response

Step 2: Create Checkout Session

Response

Step 3: Set Shipping Address & Get Methods

Response

Step 4: Select Shipping Method

Order Totals

Response

Step 5: Apply Discount (Optional)

Response

Step 6: Select Payment Method

Response

Step 7: Place Order

Final Order Summary

✓ Order Placed Successfully!

Response