diff --git a/peppol-lookup/src/main/java/network/oxalis/vefa/peppol/lookup/LookupClient.java b/peppol-lookup/src/main/java/network/oxalis/vefa/peppol/lookup/LookupClient.java
index 626b533a..c2d0f22f 100644
--- a/peppol-lookup/src/main/java/network/oxalis/vefa/peppol/lookup/LookupClient.java
+++ b/peppol-lookup/src/main/java/network/oxalis/vefa/peppol/lookup/LookupClient.java
@@ -19,21 +19,38 @@
 
 package network.oxalis.vefa.peppol.lookup;
 
-import network.oxalis.vefa.peppol.common.api.PotentiallySigned;
-import network.oxalis.vefa.peppol.common.code.Service;
-import network.oxalis.vefa.peppol.common.lang.EndpointNotFoundException;
-import network.oxalis.vefa.peppol.common.model.*;
-import network.oxalis.vefa.peppol.lookup.api.*;
-import network.oxalis.vefa.peppol.security.api.CertificateValidator;
-import network.oxalis.vefa.peppol.security.lang.PeppolSecurityException;
-
 import java.io.FileNotFoundException;
 import java.net.URI;
 import java.security.cert.X509Certificate;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Map;
 import java.util.stream.Collectors;
 
+import network.oxalis.vefa.peppol.common.api.PotentiallySigned;
+import network.oxalis.vefa.peppol.common.code.Service;
+import network.oxalis.vefa.peppol.common.lang.EndpointNotFoundException;
+import network.oxalis.vefa.peppol.common.model.DocumentTypeIdentifier;
+import network.oxalis.vefa.peppol.common.model.Endpoint;
+import network.oxalis.vefa.peppol.common.model.Header;
+import network.oxalis.vefa.peppol.common.model.ParticipantIdentifier;
+import network.oxalis.vefa.peppol.common.model.ProcessIdentifier;
+import network.oxalis.vefa.peppol.common.model.Redirect;
+import network.oxalis.vefa.peppol.common.model.ServiceInformation;
+import network.oxalis.vefa.peppol.common.model.ServiceMetadata;
+import network.oxalis.vefa.peppol.common.model.ServiceReference;
+import network.oxalis.vefa.peppol.common.model.Signed;
+import network.oxalis.vefa.peppol.common.model.TransportProfile;
+import network.oxalis.vefa.peppol.lookup.api.FetcherResponse;
+import network.oxalis.vefa.peppol.lookup.api.LookupException;
+import network.oxalis.vefa.peppol.lookup.api.MetadataFetcher;
+import network.oxalis.vefa.peppol.lookup.api.MetadataLocator;
+import network.oxalis.vefa.peppol.lookup.api.MetadataProvider;
+import network.oxalis.vefa.peppol.lookup.api.MetadataReader;
+import network.oxalis.vefa.peppol.mode.Mode;
+import network.oxalis.vefa.peppol.security.api.CertificateValidator;
+import network.oxalis.vefa.peppol.security.lang.PeppolSecurityException;
+
 public class LookupClient {
 
     private final MetadataLocator locator;
@@ -42,6 +59,19 @@ public class LookupClient {
     private final MetadataReader reader;
     private final CertificateValidator validator;
 
+    public LookupClient(Mode mode, Map<String, Object> objectStorage) {
+    	LookupClientBuilder builder = (LookupClientBuilder) objectStorage.get(LookupClientBuilder.class.getName());
+    	if (builder != null) {
+            this.locator = builder.metadataLocator;
+            this.provider = builder.metadataProvider;
+            this.fetcher = builder.metadataFetcher;
+            this.reader = builder.metadataReader;
+            this.validator = builder.certificateValidator;
+    	} else {
+    		throw new IllegalArgumentException("Object storage is expected to contain a key "+LookupClientBuilder.class.getName()+" with a reference to a builder");
+    	}
+    }
+    
     protected LookupClient(LookupClientBuilder builder) {
         this.locator = builder.metadataLocator;
         this.provider = builder.metadataProvider;
diff --git a/peppol-lookup/src/main/java/network/oxalis/vefa/peppol/lookup/LookupClientBuilder.java b/peppol-lookup/src/main/java/network/oxalis/vefa/peppol/lookup/LookupClientBuilder.java
index 1d5fff2c..fb06ca4e 100644
--- a/peppol-lookup/src/main/java/network/oxalis/vefa/peppol/lookup/LookupClientBuilder.java
+++ b/peppol-lookup/src/main/java/network/oxalis/vefa/peppol/lookup/LookupClientBuilder.java
@@ -19,10 +19,13 @@
 
 package network.oxalis.vefa.peppol.lookup;
 
+import java.util.HashMap;
+import java.util.Map;
+
 import network.oxalis.vefa.peppol.common.lang.PeppolLoadingException;
-import network.oxalis.vefa.peppol.lookup.api.MetadataProvider;
 import network.oxalis.vefa.peppol.lookup.api.MetadataFetcher;
 import network.oxalis.vefa.peppol.lookup.api.MetadataLocator;
+import network.oxalis.vefa.peppol.lookup.api.MetadataProvider;
 import network.oxalis.vefa.peppol.lookup.api.MetadataReader;
 import network.oxalis.vefa.peppol.mode.Mode;
 import network.oxalis.vefa.peppol.security.api.CertificateValidator;
@@ -118,7 +121,9 @@ public LookupClient build() throws PeppolLoadingException {
             fetcher(mode.initiate("lookup.fetcher.class", MetadataFetcher.class));
         if (metadataReader == null)
             reader(mode.initiate("lookup.reader.class", MetadataReader.class));
-
-        return new LookupClient(this);
+        
+        Map<String, Object> map = new HashMap<String, Object>();
+        map.put(LookupClientBuilder.class.getName(), this);
+        return mode.initiate("lookup.impl.class", null, map); 
     }
 }
diff --git a/peppol-lookup/src/main/java/network/oxalis/vefa/peppol/lookup/dummy/DummyLookupClient.java b/peppol-lookup/src/main/java/network/oxalis/vefa/peppol/lookup/dummy/DummyLookupClient.java
new file mode 100644
index 00000000..5a9835b7
--- /dev/null
+++ b/peppol-lookup/src/main/java/network/oxalis/vefa/peppol/lookup/dummy/DummyLookupClient.java
@@ -0,0 +1,149 @@
+package network.oxalis.vefa.peppol.lookup.dummy;
+
+import java.io.ByteArrayInputStream;
+import java.net.URI;
+import java.security.cert.CertificateFactory;
+import java.security.cert.X509Certificate;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+
+import org.bouncycastle.util.encoders.Base64;
+
+import network.oxalis.vefa.peppol.common.lang.EndpointNotFoundException;
+import network.oxalis.vefa.peppol.common.model.DocumentTypeIdentifier;
+import network.oxalis.vefa.peppol.common.model.Endpoint;
+import network.oxalis.vefa.peppol.common.model.Header;
+import network.oxalis.vefa.peppol.common.model.ParticipantIdentifier;
+import network.oxalis.vefa.peppol.common.model.ProcessIdentifier;
+import network.oxalis.vefa.peppol.common.model.ProcessMetadata;
+import network.oxalis.vefa.peppol.common.model.ServiceInformation;
+import network.oxalis.vefa.peppol.common.model.ServiceMetadata;
+import network.oxalis.vefa.peppol.common.model.ServiceReference;
+import network.oxalis.vefa.peppol.common.model.TransportProfile;
+import network.oxalis.vefa.peppol.lookup.LookupClient;
+import network.oxalis.vefa.peppol.lookup.api.LookupException;
+import network.oxalis.vefa.peppol.mode.Mode;
+import network.oxalis.vefa.peppol.security.lang.PeppolSecurityException;
+
+/**
+ * Dummy implementation of LookupClient, which can be configured via reference.conf as:
+ * 
+ * <pre>
+ 
+mode.TEST.lookup.impl.class = network.oxalis.vefa.peppol.lookup.dummy.DummyLookupClient
+
+mode.TEST.lookup.impl.dummy = {
+	uri: "http://localhost:8080/as4"
+	certificate: "MIIGkTCCBMWgAwIBA...+jUH1N7v7JJdaA="
+	transport: "peppol-transport-as4-v2_0"
+	process: "urn:fdc:peppol.eu:2017:poacc:billing:01:1.0"
+	doctype: "urn:oasis:names:specification:ubl:schema:xsd:Invoice-2::Invoice##urn:cen.eu:en16931:2017#compliant#urn:fdc:peppol.eu:2017:poacc:billing:3.0::2.1"
+}
+ * </pre>
+ * 
+ * It can be used for testing the sending process by just imitating all lookups to the same URL and profile.
+ */
+public class DummyLookupClient extends LookupClient {
+
+	private URI uri;
+	private X509Certificate certificate;
+	private TransportProfile transport;
+	private ProcessIdentifier processIdentifier;
+	private DocumentTypeIdentifier docType;
+
+	private Endpoint endpoint;
+
+	public DummyLookupClient(Mode mode, Map<String, Object> objectStorage) {
+		super(mode, objectStorage);
+		init(mode);
+	}
+
+	private void init(Mode mode) {
+		String prefix = "lookup.impl.dummy.";
+
+		String uri = mode.getString(prefix + "uri");
+		String certificateBase64 = mode.getString(prefix + "certificate");
+		String transportCode = mode.getString(prefix + "transport");
+		String process = mode.getString(prefix + "process");
+		String doctype = mode.getString(prefix + "doctype");
+
+		try {
+			this.uri = new URI(uri);
+		} catch (Exception e1) {
+			throw new RuntimeException("Cannot build URI by " + uri, e1);
+		}
+		try {
+			CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
+			this.certificate = (X509Certificate) certificateFactory.generateCertificate(new ByteArrayInputStream(Base64.decode(certificateBase64)));
+		} catch (Exception e1) {
+			throw new RuntimeException("Cannot build dummy X.509 certificate by the base64 value " + certificateBase64, e1);
+		}
+
+		this.transport = TransportProfile.of(transportCode);
+		this.endpoint = new Endpoint(this.transport, this.uri, this.certificate, null);
+		this.processIdentifier = ProcessIdentifier.of(process);
+		this.docType = DocumentTypeIdentifier.of(doctype);
+	}
+
+	@Override
+	public List<ServiceReference> getServiceReferences(ParticipantIdentifier participantIdentifier) throws LookupException {
+		return Arrays.asList(ServiceReference.of(docType, this.processIdentifier));
+	}
+
+	@Override
+	public List<DocumentTypeIdentifier> getDocumentIdentifiers(ParticipantIdentifier participantIdentifier) throws LookupException {
+		return Arrays.asList(this.docType);
+	}
+
+	@Override
+	public ServiceMetadata getServiceMetadata(ParticipantIdentifier participantIdentifier, DocumentTypeIdentifier documentTypeIdentifier) throws LookupException, PeppolSecurityException {
+		List<ProcessMetadata<Endpoint>> processes = Arrays.asList(ProcessMetadata.of(this.processIdentifier, this.endpoint));
+		ServiceInformation<Endpoint> serviceInformation = ServiceInformation.of(participantIdentifier, documentTypeIdentifier, processes);
+		return ServiceMetadata.of(serviceInformation);
+	}
+
+	@Override
+	public Endpoint getEndpoint(ServiceMetadata serviceMetadata, ProcessIdentifier processIdentifier, TransportProfile... transportProfiles) throws PeppolSecurityException, EndpointNotFoundException {
+		return Endpoint.of(getFirstOrDefault(transportProfiles), uri, certificate);
+	}
+
+	@Override
+	public Endpoint getEndpoint(ParticipantIdentifier participantIdentifier, DocumentTypeIdentifier documentTypeIdentifier, ProcessIdentifier processIdentifier, TransportProfile... transportProfiles) throws LookupException, PeppolSecurityException, EndpointNotFoundException {
+		return Endpoint.of(getFirstOrDefault(transportProfiles), uri, certificate);
+	}
+
+	@Override
+	public Endpoint getEndpoint(Header header, TransportProfile... transportProfiles) throws LookupException, PeppolSecurityException, EndpointNotFoundException {
+		return Endpoint.of(getFirstOrDefault(transportProfiles), uri, certificate);
+	}
+
+	private TransportProfile getFirstOrDefault(TransportProfile... transportProfiles) {
+		return transportProfiles != null && transportProfiles.length > 0 ? transportProfiles[0] : this.transport;
+	}
+
+	public URI getDefaultUri() {
+		return uri;
+	}
+
+	public X509Certificate getDefaultCertificate() {
+		return certificate;
+	}
+
+	public TransportProfile getDefaultTransport() {
+		return transport;
+	}
+
+	public ProcessIdentifier getDefaultProcessIdentifier() {
+		return processIdentifier;
+	}
+
+	public DocumentTypeIdentifier getDefaultDocType() {
+		return docType;
+	}
+
+	public Endpoint getDefaultEndpoint() {
+		return endpoint;
+	}
+
+}
diff --git a/peppol-lookup/src/main/resources/reference.conf b/peppol-lookup/src/main/resources/reference.conf
index 4ae2758f..eea0e213 100644
--- a/peppol-lookup/src/main/resources/reference.conf
+++ b/peppol-lookup/src/main/resources/reference.conf
@@ -38,3 +38,14 @@ mode.FRTEST.lookup.locator.hostname = acc.edelivery.tech.ec.europa.eu
 # Reader
 mode.default.lookup.reader.class = network.oxalis.vefa.peppol.lookup.reader.MultiReader
 
+# Client
+mode.default.lookup.impl.class = network.oxalis.vefa.peppol.lookup.LookupClient
+
+# Settings for dummy implementation of LookupClient
+mode.default.lookup.impl.dummy = {
+	uri: "http://localhost:8080/as4"
+	certificate: "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"
+	transport: "peppol-transport-as4-v2_0"
+	process: "urn:fdc:peppol.eu:2017:poacc:billing:01:1.0"
+	doctype: "urn:oasis:names:specification:ubl:schema:xsd:Invoice-2::Invoice##urn:cen.eu:en16931:2017#compliant#urn:fdc:peppol.eu:2017:poacc:billing:3.0::2.1"
+}
diff --git a/peppol-lookup/src/test/java/network/oxalis/vefa/peppol/lookup/dummy/DummyLookupClientTest.java b/peppol-lookup/src/test/java/network/oxalis/vefa/peppol/lookup/dummy/DummyLookupClientTest.java
new file mode 100644
index 00000000..a3d25603
--- /dev/null
+++ b/peppol-lookup/src/test/java/network/oxalis/vefa/peppol/lookup/dummy/DummyLookupClientTest.java
@@ -0,0 +1,54 @@
+package network.oxalis.vefa.peppol.lookup.dummy;
+
+import static org.testng.Assert.assertEquals;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.testng.annotations.Test;
+
+import network.oxalis.vefa.peppol.common.model.Endpoint;
+import network.oxalis.vefa.peppol.common.model.ParticipantIdentifier;
+import network.oxalis.vefa.peppol.common.model.ProcessIdentifier;
+import network.oxalis.vefa.peppol.common.model.TransportProfile;
+import network.oxalis.vefa.peppol.lookup.LookupClient;
+import network.oxalis.vefa.peppol.lookup.LookupClientBuilder;
+import network.oxalis.vefa.peppol.mode.Mode;
+
+class DummyLookupClientTest {
+
+	@Test
+	void testDummyLookupClient() throws Exception {
+		Mode mode = Mode.of("TEST");
+		Map<String, Object> map = new HashMap<String, Object>();
+		map.put(LookupClientBuilder.class.getName(), LookupClientBuilder.forMode(mode));
+		DummyLookupClient client = new DummyLookupClient(mode, map);
+
+		ProcessIdentifier pi = ProcessIdentifier.of("test");
+
+		String documentIdentifier = "busdox-docid-qns::urn:oasis:names:specification:ubl:schema:xsd:Invoice-2::Invoice##urn:cen.eu:en16931:2017#compliant#urn:fdc:peppol.eu:2017:poacc:billing:3.0::2.1";
+		ParticipantIdentifier pari = ParticipantIdentifier.of("0184:12345678");
+		assertEquals(client.getDocumentIdentifiers(pari).toString(), "[" + documentIdentifier + "]");
+
+		TransportProfile tp = TransportProfile.of("test");
+		Endpoint endpoint = client.getEndpoint(null, tp);
+		assertEquals(endpoint.getAddress().toString(), "http://localhost:8080/as4");
+		assertEquals(endpoint.getCertificate().getSubjectX500Principal().getName(), "C=NO,O=Direktoratet for forvaltning og IKT,OU=PEPPOL PRODUCTION AP,CN=PNO000001");
+		assertEquals(endpoint.getTransportProfile().toString(), "TransportProfile{test}");
+
+		assertEquals(client.getEndpoint(null, pi, tp).getTransportProfile().toString(), "TransportProfile{test}");
+		assertEquals(client.getEndpoint(null, null, pi, tp).getTransportProfile().toString(), "TransportProfile{test}");
+		assertEquals(client.getServiceMetadata(null, null).getServiceInformation().getEndpoint(client.getDefaultProcessIdentifier(), client.getDefaultTransport()).getAddress().toString(), "http://localhost:8080/as4");
+		assertEquals(client.getServiceReferences(pari).get(0).getDocumentTypeIdentifier().toString(), documentIdentifier);
+	}
+
+	@Test
+	public void testOverridingConfiguration() throws Exception {
+		assertEquals(LookupClient.class.getName(), LookupClientBuilder.forProduction().build().getClass().getName());
+		assertEquals(LookupClient.class.getName(), LookupClientBuilder.forMode("TEST").build().getClass().getName());
+		LookupClient dummyClient = LookupClientBuilder.forMode("DUMMY").build();
+		assertEquals(DummyLookupClient.class.getName(), dummyClient.getClass().getName());
+		assertEquals("http://localhost:9090/as4", ((DummyLookupClient) dummyClient).getDefaultEndpoint().getAddress().toString());
+	}
+
+}
diff --git a/peppol-lookup/src/test/resources/reference.conf b/peppol-lookup/src/test/resources/reference.conf
new file mode 100644
index 00000000..10a58cad
--- /dev/null
+++ b/peppol-lookup/src/test/resources/reference.conf
@@ -0,0 +1,3 @@
+mode.DUMMY.inherit=TEST
+mode.DUMMY.lookup.impl.class = network.oxalis.vefa.peppol.lookup.dummy.DummyLookupClient
+mode.DUMMY.lookup.impl.dummy.uri="http://localhost:9090/as4"
\ No newline at end of file