1. Retrieve shipment group instance from DB by qid and
    perform necessary checks.
  2. Validate request data using request_serializer_class
  3. Check shipment group has at least one outbound
  4. Check request has appropriate number of codes for
    number of outbounds in shipment group
  5. Update shipping details for all outbounds in group
  6. Create events for shipment group and for each outbound
  7. Re-retrieve shipment group instance from db
  8. Return representation using response_serializer_class
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