static RESTContext execute(RESTContext restContext)

RESTContext restContext = new RESTContext();
restContext.setAddress(credentials.getAddress());
restContext.setRequest(getRequest(credentials, bo, referenceLabel));
restContext.setReference("GLS: Post Shipment for " + referenceProtokoll);

restContext.setEncoding(RESTContext.ENCODING_UTF_8);
restContext.setContentType(RESTContext.FORMAT_JSON);
restContext.setAcceptEncoding("gzip,deflate");
restContext.setAcceptLanguage("de");
restContext.setAccept(RESTContext.FORMAT_JSON);
restContext.setAuthorization(RESTContext.Authorization.Basic);
restContext.setUser(credentials.getUser());
restContext.setPassword(credentials.getPassword());

context.log("Starte Übermittlung des Lieferscheins an GLS: " + restContext.getUrlWithParameters());
RESTUtils.execute(restContext);
RESTShipmentResponseGLS response = null;
if (restContext.isError()) {
    context.log("Fehler beim Übermitteln des GLS Shipment Response: " + restContext.getErrorMessage());
} else {
    try {
        response = objectMapper.readValue(restContext.getResponse(), RESTShipmentResponseGLS.class);
        // ...

    } catch (JsonProcessingException e) {
        throw new BusinessException("Fehler beim Auswerten des GLS Shipment Response: " + e.getMessage());
    }

}

Example VAT ID check (inline)

RESTContext result = new RESTContext();

result.setContentType(RESTContext.FORMAT_APPLICATION_X_WWW_FORM_URLENCODED);
result.setEncoding(RESTContext.ENCODING_UTF_8);
result.setTest(Boolean.FALSE);
result.setAddress(pruefungsObjekt.getUrl());
result.addParameter(Parameter.UST_ID_1, pruefungsObjekt.getValue(Parameter.UST_ID_1));
result.addParameter(Parameter.UST_ID_2, pruefungsObjekt.getValue(Parameter.UST_ID_2));
result.addParameter(Parameter.FIRMENNAME, pruefungsObjekt.getValue(Parameter.FIRMENNAME));
result.addParameter(Parameter.ORT, pruefungsObjekt.getValue(Parameter.ORT));
result.addParameter(Parameter.PLZ, pruefungsObjekt.getValue(Parameter.PLZ));
result.addParameter(Parameter.STRASSE, pruefungsObjekt.getValue(Parameter.STRASSE));
result.setReference("Prüfung USt-ID für Prüfling " + pruefungsObjekt.getPruefling());

RESTUtils.execute(restContext);