private Map<String, Object> getSignedParams() {
Map<String, Object> signedParams =
(data != null) ? new HashMap<>(data) : new HashMap<String, Object>();
if (factoryId != null) signedParams.put("factory_id", factoryId);
signedParams.put("access_key", credentials.getAccessKey());
signedParams.put("timestamp", timestamp != null ? timestamp : Utils.isoTimestamp());
Map<String, Object> additionalParams = new HashMap<>(signedParams);
additionalParams.remove("file");
String signature = generateSignature(additionalParams);
signedParams.put("signature", signature);
return signedParams;
}
