1) The recommended scenario for using InfoServices is based on using the getEventsForCustomerV4 method in conjunction with the markEventsAsProcessedV1 method.
After retrieving statuses using the getEventsForWaybillV4 method and saving the events to the database, you should confirm this using the markEventsAsProcessedV1 method, specifying the <confirmId> identifier of the same value as returned by getEventsForWaybillV4. This prevents us from receiving the same events each time.

2) Parcel waybill / tracking number can change sometimes and in such a cases you should track the new parcel number. It can happen in the following situations:
* 230402 - Parcel redirected (on request of its sender or receiver)
* 230403, 230408 - Parcel to be returned to sender
The new tracking number is provided in the <eventDataList><value> element.
See an example below of tracing by our InfoServices getEventsForWaybillV1 method (return of the 0000285761310U parcel which gets the new number):
            <eventsList>
               <businessCode>230403</businessCode>
               <country>PL</country>
               <depot>1322</depot>
               <depotName>Katowice</depotName>
               <description>Parcel return</description><!--to be returned to sender-->
               <eventDataList>
                  <code/>
                  <description/>
                  <value>0000010923567L</value><!--the new tracking number-->
               </eventDataList>
               <eventTime>2021-01-08T11:18:52.122</eventTime>
               <objectId>6980758665</objectId>
               <packageReference>2366692</packageReference>
               <parcelReference/>
               <waybill>0000285761310U</waybill>
            </eventsList>
Next you follow the 0000010923567L parcel:
            <eventsList>
               <businessCode>190101</businessCode><!--the same code as for delivery to the original receiver-->
               <country>PL</country>
               <depot>1357</depot>
               <depotName>KATOWICE 2</depotName>
               <description>Parcel delivered</description><!--returned to sender-->
               <eventDataList>
                  <code/>
                  <description/>
                  <value>bednarek</value>
               </eventDataList>
               <eventTime>2021-01-11T16:42:28.637</eventTime>
               <objectId>1357500000032543569</objectId>
               <packageReference>2366692</packageReference>
               <parcelReference/>
               <waybill>0000010923567L</waybill>
            </eventsList>
			