Create Order Workflow

[paulfryer]

Workflow Description

The Create Order workflow should orchestrate over all the systems needed to create a new order.

Example Visual Workflow

Note: This example diagram is showing Lambda, but the actual workflow should orchestrate over API Gateway. The API Gateway endpoints should use IAM_ROLE for authentication.

Workflow Steps

Sequence	Step Name	Details
1	createOrder	The task of this function is to create an order object with order metadata like orderId, creation time etc.
2	setOrderDetails	Add the details provide by the API input like product ids, quantity, shopper id etc. to the order object
3	batchGetProductDetails	Get the product details, title, img url etc. for the product ids in the order object
4	batchGetProductPrices	Get the product prices for the product ids in the order object
5	batchGetProductPromotions	Get the product promotions for the product ids in the order object
6	getShopperDetails	Get shopper details like loyalty status for the shopper id in the order object
7	getTaxes	Get taxes for the products in the order using product details, prices, promotions, addresses etc.
8	validate	Validate data like taxes, inventory etc. in the order object, identifying the state of the order, in progress, ready to sign etc.
9	saveOrder	Save the order to the database - S3, DynamoDB etc.This step may also include index generation for list and search operations.

Dependent Issues

5 We need to build out the Tax Model to so the getTaxes to provide support for the getTaxes step.

6 We need to create the Promotions Model so the check out process can check for promotions.

[paulfryer]

Candidate workflow based on API Gateway calls, not Lambda.