Implement Checkout MVP for PWA

[ericerway]

This issue is for the following packages:

[X] venia-concept
[ ] pwa-buildpack
[X] peregrine
[ ] pwa-module
[ ] pwa-devdocs

This issue is a:

[ ] Bug
[X] Feature suggestion
[ ] Documentation issue
[ ] Other (Please Specify)

Environment

Question	Answer
Magento version
Operating System + version
node.js version (node -v)
npm version (npm -v)

Description

As a shopper, I want to make a purchase from the Magento PWA store (unstyled) that has already been added to cart so that I can understand how Venia works in the future.

Scenario:

• One (1) item is already in the shopping cart; likely from Category or PD [DONE]
• Checkout is initiated by shopper (action) [DONE]
• Shipping information captured (e.g. Veronica Costello) [WIP]
• Shipping method is fixed (no choice) [DONE]
• Billing address is same as shipping (assumed) [DONE]
• Discount code and gift card not enabled [DONE]
• Edits and validations not required [DONE]
• Order is placed by shopper [WIP]
• Confirmation page with order# shown (basics) [DONE]

Expected result:

Basic checkout experience with real data from Magento store using REST API that creates an order in the system with minimal changes to the interface. Utilizes current and creates new peregrine UI components with React as appropriate but only where necessary.

Requires knowledge of REST/GRAPHQL interactions with Apollo and use of current Magento 2 API.

Possible solutions:

Demo of minimal checkout experience (unstyled) through confirmation page and order placed (seen) from Magento 2 admin panel. Checkout should be built in such a way that applying Venia styling and switching to GRAPHQL (fully) is less difficult from a developer experience.

[ericerway]

Almost complete; need to merge with GraphQL [SPIKE] and related work. Marking for Sprint 20 to complete and updating estimate. Linking to newly created Venia sample data issue.

[ericerway]

Updating for Sprint 21 to include editable shipping address/method and creation of an order in Magento which will be verified in the admin. New estimate to reflect remaining work.

[ericerway]

Review carried to Sprint 22.