When this action is performed, the delivery transitions from
SUBMITTED state. A delivery can only be submitted once.
This action will update stock and package prices, if these options are set in the delivery object.
Meta information about a delivery can still be edited after submission.
delivery_date attribute can optionally contain timezone information. Inputs without explicit timezone information will be assumed to be UTC+0. Submitted deliveries without any delivery date information will have this attribute default to the current date and time in UTC+0.