Adding a new discount code.
_session_hash (string)
Required. Session identifier (received during login - doLogin)
code (string)
Required. Code
discount (double)
Required. Discount in percent
valid_usage (integer)
Number of uses, 0 means no limit
valid_from (dateTime)
Valid from
valid_to (dateTime)
Valid to
id (integer)Identifier of the created discount code.