When node gets Parcel it will be processed by ParcelProcessor.
Parcel's processor download parcel or get it from constructor params;
Node#checkItemInternal(HashId, HashId, Approvable, boolean, boolean, boolean)for both payment and payload items, but with
isCheckingForceparam set to
falsefor payload: payload checking wait for payment item will be processed (goes through
after payment have been processed payload is start checking (goes through
finally parcel's processor removing (goes through