POST sales order will be supported for PSP RFH until March 31th 2021.

New scenarios and endpoints have been added for direct sales sales order corrections:
Direct sales Sales order corrections

Direct purchase supply (purchase tip) is created with a customer specific direct sales supply line using a short trade period. As an indication a trade period with a maximum of 3 hours is applicable, this can vary in the future. The customer can set a notification in the sales channel or his ERP based on the duration of the trade period and directly buy on this supply.
Direct purchase supply can only be created with Direct sales supply not with catalog supply.
See Direct sales Supply

We have created a new custom authorization server. This will help us support new sign-in methods in the future.

Added a cancellation deadline in direct sales sales orders.
For further explanation seeSales Orders