**What**
- Implement adding a line item to order (edit)
**How**
- _by implementing the following "flow"_
- generate a line item
- computing line item adjustments for that line item
- creating tax lines
- creating a change record
**Testing**
- **_integration tests_**
- check if line item and order item change objects are created (with correct tax lines)
- line item adjustments are generated if
- fixed discount is applied to cart
- percentage discount is applied
- **_unit tests_**
- ensure that methods from Inventory, LineItem, LineItemAdjustment etc. services are called
---
RESOLVES CORE-495
**what**
Support `updateLineItem` which does the following:
- If no item change exist then create a new one and attaches the clone item with the adjustments and tax lines
- if an item change exists then delete/create adjustments and tax lines and update the cloned item quantity
**Tests**
- Unit tests core + client
- integration tests
- When no item change already exists
- When an item change already exists
FIXES CORE-497
**What**
- Improve `retrieveActive` to take into account `(confirmed/canceled/declined)_at`
**Test**
- one more Integration test on that case
FIXES CORE-601
**What**
- a MoneyAmount record can be created with either providing region or currency. MA records cannot be inserted in the DB without currency due to not null constraints therefore the currency needs to be inferred from provided region
**How**
- by using the same utility that fixes this issue on PL update
**Testing**
- extend the "create PL" integration test to handle a MA with a region
---
FIXES CORE-525
**What**
- Implements the admin create end point
- Service implementation of the create method and the retrieveActive as well as the totals computation
- Improve compute line items
- client
- medusa-js api
- medusa-react mutations hooks
**Tests**
- Unit tests of the create end points
- Unit tests of the service create method
- Integration tests for admin that also take into account totals computations
- client
- medusa-js tests
- medusa-react hooks tests
FIXES CORE-491
**What**
- Implements the admin/store retrieval end point
- Service implementation of the retrieve method
- Service implementation of the computeLineItems method which aggregates the right line item based on the changes that are made
- client
- medusa-js api
- medusa-react queries hooks
**Tests**
- Unit tests of the retrieval end points
- Unit tests of the service retrieve method and computeLineItems
- Integration tests for admin/store
- client
- medusa-js tests
- medusa-react hooks tests
FIXES CORE-492
**What**
- add order editing entities
- add repositories
- add a feature flag for the order editing feature
- add the migrations file
RESOLVES CORE-490
* docs: rearranged and removed installation section
> Removed "Prerequisite Background Knowledge" section
> Created "Required Tools" and "Optional Tools" sections
> Moved "Node.js", "Git", and "Medusa CLI" to Required Section
> "PostgreSQL" and "Redis" to "Optional Section"
* removed links from heading
* Removed Lists under required tools
* added text below headline
