Flexfields for Price List Header REST Endpoints

Order Management/Price Lists/Flexfields for Price List Header
The operations from the Order Management/Price Lists/Flexfields for Price List Header category.
Create header flexfields
Method: post
Path: /fscmRestApi/resources/11.13.18.05/priceLists/{PriceListId}/child/headerDFF
Get all header flexfields
Method: get
Path: /fscmRestApi/resources/11.13.18.05/priceLists/{PriceListId}/child/headerDFF
Get one header flexfield
Method: get
Path: /fscmRestApi/resources/11.13.18.05/priceLists/{PriceListId}/child/headerDFF/{PriceListId2}
Update one header flexfield
Method: patch
Path: /fscmRestApi/resources/11.13.18.05/priceLists/{PriceListId}/child/headerDFF/{PriceListId2}