curl -X PUT \
'https://api.allegro.pl/sale/offer-modification-commands/{commandId}' \
-H 'Authorization: Bearer {token}' \
-H 'Accept: application/vnd.allegro.public.v1+json' \
-H 'Content-Type: application/vnd.allegro.public.v1+json' \
-d '{
          "modification": {
              "delivery": {
                  "handlingTime": "P7D"      - czas wysyłki w formacie ISO 8601
              }
          },
          "offerCriteria": [
              {
                  "offers": [
                      {
                             "id": "11223344556"
                      },
                      {
                             "id": "11335577991"
                      }
                  ],
                  "type": "CONTAINS_OFFERS"
              }
          ]
}'