modified.java

private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
...
private byte[] createPKPassBinaries(PKPass pass, PKSigningInformation pkSigningInformation, InputStream thumbnail, InputStream thumbnail2x) throws Exception {
    return new PKFileBasedSigningUtil(OBJECT_MAPPER).createSignedAndZippedPkPassArchive(pass, createPKPassTemplate(thumbnail, thumbnail2x), pkSigningInformation);
}