[#52062119] Added user merge resource.
Merge pull request #42 from jamesiarmes/user-merge-webapp

[#52062119] Added user merge resource.
Removed function that shouldn't have been committed.
[#50991929] Added endpoint to retrieve html for header.
Merge pull request #45 from arturo-c/add_theme_html

[SPRINTFIX][#50991929] Added endpoint to retrieve html for header.
Merge pull request #43 from jamesiarmes/remove-function

Remove function with commented out body that should not have been committed.
[#51851593] Added documentation for invoce property on order create line items.
Merge pull request #49 from jamesiarmes/order-create-line-items-invoice-webapp

[#51851593] Added documentation for invoice property on order create line items