diff --git a/lib/src/main/java/com/auth0/msg/AbstractMessage.java b/lib/src/main/java/com/auth0/msg/AbstractMessage.java
new file mode 100644
index 00000000..372fd17d
--- /dev/null
+++ b/lib/src/main/java/com/auth0/msg/AbstractMessage.java
@@ -0,0 +1,189 @@
+package com.auth0.msg;
+
+import com.auth0.jwt.algorithms.Algorithm;
+import com.fasterxml.jackson.core.JsonGenerationException;
+import com.fasterxml.jackson.databind.JsonMappingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * This abstract class provides basic processing of messages
+ */
+public abstract class AbstractMessage implements Message {
+    private Map<ClaimType, Object> claims;
+    private String input;
+    private Error error = null;
+    private boolean verified = false;
+    ObjectMapper mapper = new ObjectMapper();
+
+    protected AbstractMessage(Map<ClaimType, Object> claims) {
+        this.claims = claims;
+    }
+
+    /**
+     * @param input the urlEncoded String representation of a message
+     * @return a Message representation of the UrlEncoded string
+     */
+    public Message fromUrlEncoded(String input) throws MalformedURLException, IOException {
+        AbstractMessage msg = mapper.readValue(new URL(input), AbstractMessage.class);
+        return msg;
+    }
+
+    /**
+     * Takes the claims of this instance of the AbstractMessage class and serializes them
+     * to an urlEncoded string
+     *
+     * @return an urlEncoded string
+     */
+    public String toUrlEncoded() throws SerializationException {
+        // TODO
+        // Serialize the content of this instance (the claims map) into an UrlEncoded string
+        return "";
+    }
+
+    /**
+     * Logic to extract from the JSON string the values
+     *
+     * @param input The JSON String representation of a message
+     * @return a Message representation of the Json
+     */
+    public Message fromJson(String input) {
+        this.input = input;
+        try {
+            // Convert JSON string to Object
+            AbstractMessage msg = mapper.readValue(input, AbstractMessage.class);
+            return msg;
+        } catch (JsonGenerationException e) {
+            e.printStackTrace();
+        } catch (JsonMappingException e) {
+            e.printStackTrace();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    /**
+     * Takes the claims of this instance of the AbstractMessage class and serializes them
+     * to a json string
+     *
+     * @return a JSON String representation in the form of a hashMap mapping string -> string
+     */
+    public String toJson() throws SerializationException {
+        if (this.error != null) {
+            //This should be custom exception
+            throw new InvalidClaimsException("Error present cannot serialize message");
+        }
+        return "";
+    }
+
+    /**
+     * @param input the jwt String representation of a message
+     * @param Key   that might contain the necessary key
+     * @return a Message representation of the JWT
+     */
+    public Message fromJwt(String input, Key key) {
+        this.input = input;
+        //This will have logic to parse Jwt to claims
+        return this;
+    }
+
+    /**
+     * @param input the jwt String representation of a message
+     * @param KeyJar that might contain the necessary key
+     * @return a Message representation of the JWT
+     */
+    public Message fromJwt(String input, KeyJar jar) {
+        this.input = input;
+        //This will have logic to parse Jwt to claims
+        return this;
+    }
+
+    /**
+     * Serialize the content of this instance (the claims map) into a jwt string
+     * @param KeyJar the signing keyjar
+     * @param String the algorithm to use in signing the JWT
+     * @return a jwt String
+     * @throws InvalidClaimsException
+     */
+    public String toJwt(KeyJar keyjar, Algorithm algorithm) throws
+            InvalidClaimsException, SerializationException {
+        return null;
+    }
+
+    /**
+     * Serialize the content of this instance (the claims map) into a jwt string
+     * @param Key the signing key
+     * @param String the algorithm to use in signing the JWT
+     * @return a jwt String
+     * @throws InvalidClaimsException
+     */
+    public String toJwt(Key key, Algorithm algorithm) throws InvalidClaimsException, SerializationException {
+        return null;
+    }
+
+    /**
+     * verify that the required claims are present
+     * @return whether the verification passed
+     */
+    public boolean verify() {
+        //This method will set error if verification fails
+        return true;
+    }
+
+    /**
+     * add the claim to this instance of message
+     * @param ClaimType the name of the claim
+     * @param Object the value of the claim to add to this instance of Message
+     * @return a Message representation of the Json
+     */
+    public void addClaim(ClaimType name, Object value) {
+        // verify 'name’ is a valid claim and then check the type is valid before adding
+    }
+
+    /**
+     * @param String endpoint to base the request url on
+     * @return a String for the representation of the formatted request
+     */
+    public String getRequestWithEndpoint(String authorizationEndpoint) {
+        return null;
+    }
+
+    /**
+     * @return Error an object representing the error status of claims verification
+     */
+    public Error getError() {
+        return error;
+    }
+
+    /**
+     * @return List of the list of claims for this messsage
+     */
+    public Map<ClaimType, Object> getClaims(){
+        return this.claims;
+    }
+
+    /**
+     * @return List of the list of standard optional claims for this messsage type
+     */
+    protected List<ClaimType> getOptionalClaims(){
+        return Collections.emptyList();
+    }
+
+    /**
+     * @return List of the list of standard required claims for this messsage type
+     */
+    abstract protected List<ClaimType> getRequiredClaims();
+
+    @Override
+    public String toString() {
+        //Override to return user friendly value
+        return super.toString();
+    }
+}
diff --git a/lib/src/main/java/com/auth0/msg/AlgorithmEnum.java b/lib/src/main/java/com/auth0/msg/AlgorithmEnum.java
new file mode 100644
index 00000000..77dc325f
--- /dev/null
+++ b/lib/src/main/java/com/auth0/msg/AlgorithmEnum.java
@@ -0,0 +1,14 @@
+package com.auth0.msg;
+
+/**
+ * This enum specifies the encryption and signing algorithm type
+ */
+public enum AlgorithmEnum {
+    RS256,
+    RS384,
+    RS512,
+    HS256,
+    HS384,
+    HS512,
+    ES256;
+}
diff --git a/lib/src/main/java/com/auth0/msg/ClaimType.java b/lib/src/main/java/com/auth0/msg/ClaimType.java
new file mode 100644
index 00000000..aabc4c2d
--- /dev/null
+++ b/lib/src/main/java/com/auth0/msg/ClaimType.java
@@ -0,0 +1,21 @@
+package com.auth0.msg;
+
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * This enum specifies the claims and their allowed values to allow for validation of messages
+ */
+public enum ClaimType {
+
+    GRANT_TYPE("grant_type", Arrays.asList("refresh_token")),
+    ERROR("error", Arrays.asList("invalid_request", "unauthorized_client"));
+
+    private final String name;
+    private final List<String> allowedValues;
+
+    ClaimType(String name, List<String> allowedValues) {
+        this.name = name;
+        this.allowedValues = allowedValues;
+    }
+}
\ No newline at end of file
diff --git a/lib/src/main/java/com/auth0/msg/DataLocation.java b/lib/src/main/java/com/auth0/msg/DataLocation.java
new file mode 100644
index 00000000..d49f9047
--- /dev/null
+++ b/lib/src/main/java/com/auth0/msg/DataLocation.java
@@ -0,0 +1,8 @@
+package com.auth0.msg;
+
+/**
+ * This enum specifies whether the data will be placed in a fragment or in a query part
+ */
+public enum DataLocation {
+    FRAGMENT, QUERY_STRING, FORM_POST
+}
diff --git a/lib/src/main/java/com/auth0/msg/InvalidClaimsException.java b/lib/src/main/java/com/auth0/msg/InvalidClaimsException.java
new file mode 100644
index 00000000..acd83ef7
--- /dev/null
+++ b/lib/src/main/java/com/auth0/msg/InvalidClaimsException.java
@@ -0,0 +1,14 @@
+package com.auth0.msg;
+
+/**
+ * A runtime exception that is thrown when there is an invalid claim in a Message object type
+ */
+public class InvalidClaimsException extends RuntimeException {
+    public InvalidClaimsException(String message) {
+        this(message, null);
+    }
+
+    public InvalidClaimsException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}
diff --git a/lib/src/main/java/com/auth0/msg/Jwk.java b/lib/src/main/java/com/auth0/msg/Jwk.java
new file mode 100644
index 00000000..5aac2c3e
--- /dev/null
+++ b/lib/src/main/java/com/auth0/msg/Jwk.java
@@ -0,0 +1,8 @@
+package com.auth0.msg;
+
+public class Jwk {
+    public Key importPrivateRsaKeyFromFile(String filename){
+        // TODO
+        return new Key();
+    }
+}
\ No newline at end of file
diff --git a/lib/src/main/java/com/auth0/msg/Key.java b/lib/src/main/java/com/auth0/msg/Key.java
new file mode 100644
index 00000000..590c598f
--- /dev/null
+++ b/lib/src/main/java/com/auth0/msg/Key.java
@@ -0,0 +1,4 @@
+package com.auth0.msg;
+
+public class Key {
+}
\ No newline at end of file
diff --git a/lib/src/main/java/com/auth0/msg/KeyBundle.java b/lib/src/main/java/com/auth0/msg/KeyBundle.java
new file mode 100644
index 00000000..e8a78114
--- /dev/null
+++ b/lib/src/main/java/com/auth0/msg/KeyBundle.java
@@ -0,0 +1,4 @@
+package com.auth0.msg;
+
+public class KeyBundle {
+}
diff --git a/lib/src/main/java/com/auth0/msg/KeyJar.java b/lib/src/main/java/com/auth0/msg/KeyJar.java
new file mode 100644
index 00000000..2861df31
--- /dev/null
+++ b/lib/src/main/java/com/auth0/msg/KeyJar.java
@@ -0,0 +1,7 @@
+package com.auth0.msg;
+
+public class KeyJar {
+    public void addKeyBundle(String owner, KeyBundle kb) {
+        // TODO
+    }
+}
diff --git a/lib/src/main/java/com/auth0/msg/Message.java b/lib/src/main/java/com/auth0/msg/Message.java
new file mode 100644
index 00000000..49f03d9f
--- /dev/null
+++ b/lib/src/main/java/com/auth0/msg/Message.java
@@ -0,0 +1,110 @@
+package com.auth0.msg;
+
+import com.auth0.jwt.algorithms.Algorithm;
+
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.util.Map;
+
+/**
+ * This interface all the methods related to message processing.
+ */
+public interface Message {
+
+    /**
+     * Serialize the content of this instance (the claims map) into a JSON object
+     * @return a JSON String representation of the message
+     * @throws SerializationException
+     */
+    String toJson() throws SerializationException;
+
+    /**
+     * Serialize the content of the claims map into an UrlEncoded string
+     * @return a urlEncoded string
+     * @throws SerializationException
+     */
+    String toUrlEncoded() throws SerializationException;
+
+    /**
+     * Serialize the content of this instance (the claims map) into a jwt string
+     * @param Key the signing key
+     * @param String the algorithm to use in signing the JWT
+     * @return a jwt String
+     * @throws InvalidClaimsException
+     */
+    String toJwt(Key key, Algorithm algorithm) throws InvalidClaimsException, SerializationException;
+
+    /**
+     * Serialize the content of this instance (the claims map) into a jwt string
+     * @param KeyJar the signing keyjar
+     * @param String the algorithm to use in signing the JWT
+     * @return a jwt String
+     * @throws InvalidClaimsException
+     */
+    String toJwt(KeyJar jar, Algorithm algorithm) throws InvalidClaimsException, SerializationException;
+
+    /**
+     * Logic to extract from the string the values
+     * @param input The JSON String representation of a message
+     * @return a Message representation of the Json
+     */
+    Message fromJson(String input);
+
+    /**
+     * @param input the urlEncoded String representation of a message
+     * @return a Message representation of the UrlEncoded string
+     */
+    Message fromUrlEncoded(String input) throws MalformedURLException, IOException;
+
+    /**
+     *
+     * @param input the jwt String representation of a message
+     * @param key that might contain the necessary key
+     * @return a Message representation of the JWT
+     */
+    Message fromJwt(String input, Key key);
+
+    /**
+     *
+     * @param input the jwt String representation of a message
+     * @param KeyJar that might contain the necessary key
+     * @return a Message representation of the JWT
+     */
+    Message fromJwt(String input, KeyJar jar);
+
+    /**
+     * verify that the required claims are present
+     * @return whether the verification passed
+     */
+    boolean verify();
+
+    /**
+     *
+     * @param name of the claim
+     * @param value of the claim
+     */
+    void addClaim(ClaimType name, Object value);
+
+    /**
+     *
+     * @return Map of claims
+     * @throws InvalidClaimsException
+     */
+    Map<ClaimType, Object> getClaims() throws InvalidClaimsException;
+
+    /**
+     *
+     * @param String authorization endpoint
+     */
+    String getRequestWithEndpoint(String authorizationEndpoint, DataLocation location);
+
+    /**
+     * @return the error object representing an error in verification
+     */
+    Error getError();
+
+    /**
+     * @return boolean for whether there is an error in verification
+     */
+    boolean hasError();
+}
diff --git a/lib/src/main/java/com/auth0/msg/MessageUtil.java b/lib/src/main/java/com/auth0/msg/MessageUtil.java
new file mode 100644
index 00000000..b8b6ab83
--- /dev/null
+++ b/lib/src/main/java/com/auth0/msg/MessageUtil.java
@@ -0,0 +1,19 @@
+package com.auth0.msg;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class MessageUtil {
+    /**
+     * Returns a hashmap representation of the contents of the urlEncoded string
+     * which is passed in as a parameter
+     *
+     * @param urlEncoded the urlEncoded String representation of a message
+     * @return a map of the key value pairs encoded in the string parameter
+     */
+    public static Map<String, Object> claimsFromUrlEncoded(String urlEncoded) throws Exception {
+        //Logic to extract from the string the values
+        Map<String, Object> values = new HashMap<String, Object>();
+        return values;
+    }
+}
diff --git a/lib/src/main/java/com/auth0/msg/ProviderConfigurationResponse.java b/lib/src/main/java/com/auth0/msg/ProviderConfigurationResponse.java
new file mode 100644
index 00000000..81b537fd
--- /dev/null
+++ b/lib/src/main/java/com/auth0/msg/ProviderConfigurationResponse.java
@@ -0,0 +1,31 @@
+package com.auth0.msg;
+
+import java.util.List;
+import java.util.Map;
+
+public class ProviderConfigurationResponse extends AbstractMessage{
+
+    public ProviderConfigurationResponse(Map<ClaimType, Object> claims){
+        super(claims);
+    }
+
+    @Override
+    protected List<ClaimType> getRequiredClaims() {
+        return null;
+    }
+
+    @Override
+    public Map<ClaimType, Object> getClaims() throws InvalidClaimsException {
+        return null;
+    }
+
+    @Override
+    public String getRequestWithEndpoint(String authorizationEndpoint, DataLocation location) {
+        return null;
+    }
+
+    @Override
+    public boolean hasError() {
+        return false;
+    }
+}
diff --git a/lib/src/main/java/com/auth0/msg/RSAKey.java b/lib/src/main/java/com/auth0/msg/RSAKey.java
new file mode 100644
index 00000000..38e92259
--- /dev/null
+++ b/lib/src/main/java/com/auth0/msg/RSAKey.java
@@ -0,0 +1,4 @@
+package com.auth0.msg;
+
+public class RSAKey {
+}
\ No newline at end of file
diff --git a/lib/src/main/java/com/auth0/msg/RegistrationRequest.java b/lib/src/main/java/com/auth0/msg/RegistrationRequest.java
new file mode 100644
index 00000000..e1c4fed7
--- /dev/null
+++ b/lib/src/main/java/com/auth0/msg/RegistrationRequest.java
@@ -0,0 +1,31 @@
+package com.auth0.msg;
+
+import java.util.List;
+import java.util.Map;
+
+public class RegistrationRequest extends AbstractMessage{
+
+    public RegistrationRequest(Map<ClaimType, Object> claims){
+        super(claims);
+    }
+
+    @Override
+    protected List<ClaimType> getRequiredClaims() {
+        return null;
+    }
+
+    @Override
+    public Map<ClaimType, Object> getClaims() throws InvalidClaimsException {
+        return null;
+    }
+
+    @Override
+    public String getRequestWithEndpoint(String authorizationEndpoint, DataLocation location) {
+        return null;
+    }
+
+    @Override
+    public boolean hasError() {
+        return false;
+    }
+}
diff --git a/lib/src/main/java/com/auth0/msg/RegistrationResponse.java b/lib/src/main/java/com/auth0/msg/RegistrationResponse.java
new file mode 100644
index 00000000..7fb5fe89
--- /dev/null
+++ b/lib/src/main/java/com/auth0/msg/RegistrationResponse.java
@@ -0,0 +1,31 @@
+package com.auth0.msg;
+
+import java.util.List;
+import java.util.Map;
+
+public class RegistrationResponse extends AbstractMessage{
+
+    public RegistrationResponse(Map<ClaimType, Object> claims){
+        super(claims);
+    }
+
+    @Override
+    protected List<ClaimType> getRequiredClaims() {
+        return null;
+    }
+
+    @Override
+    public Map<ClaimType, Object> getClaims() throws InvalidClaimsException {
+        return null;
+    }
+
+    @Override
+    public String getRequestWithEndpoint(String authorizationEndpoint, DataLocation location) {
+        return null;
+    }
+
+    @Override
+    public boolean hasError() {
+        return false;
+    }
+}
diff --git a/lib/src/main/java/com/auth0/msg/SerializationException.java b/lib/src/main/java/com/auth0/msg/SerializationException.java
new file mode 100644
index 00000000..3f0a6da1
--- /dev/null
+++ b/lib/src/main/java/com/auth0/msg/SerializationException.java
@@ -0,0 +1,14 @@
+package com.auth0.msg;
+
+/**
+ * A runtime exception that is thrown when there is an issue with serialization of the Message type
+ */
+public class SerializationException extends RuntimeException {
+    public SerializationException(String message) {
+        this(message, null);
+    }
+
+    public SerializationException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}
diff --git a/lib/src/test/java/org/oidc/message/AbstractMessageTest.java b/lib/src/test/java/org/oidc/message/AbstractMessageTest.java
new file mode 100644
index 00000000..22a4817a
--- /dev/null
+++ b/lib/src/test/java/org/oidc/message/AbstractMessageTest.java
@@ -0,0 +1,5 @@
+package com.auth0.msg;
+
+public class AbstractMessageTest {
+
+}