diff --git a/src/main/java/com/bitwarden/passwordless/PasswordlessClientBuilder.java b/src/main/java/com/bitwarden/passwordless/PasswordlessClientBuilder.java
index 97e5d95..1845b03 100644
--- a/src/main/java/com/bitwarden/passwordless/PasswordlessClientBuilder.java
+++ b/src/main/java/com/bitwarden/passwordless/PasswordlessClientBuilder.java
@@ -39,7 +39,7 @@
  * @see PasswordlessOptions
  * @see PasswordlessClient
  */
-@RequiredArgsConstructor(access = AccessLevel.PRIVATE)
+@RequiredArgsConstructor
 @Getter(AccessLevel.PACKAGE)
 public class PasswordlessClientBuilder {
 
diff --git a/src/main/java/com/bitwarden/passwordless/PasswordlessOptions.java b/src/main/java/com/bitwarden/passwordless/PasswordlessOptions.java
index 2cc779b..dcb7b25 100644
--- a/src/main/java/com/bitwarden/passwordless/PasswordlessOptions.java
+++ b/src/main/java/com/bitwarden/passwordless/PasswordlessOptions.java
@@ -1,17 +1,20 @@
 package com.bitwarden.passwordless;
 
 import lombok.*;
+import lombok.experimental.FieldDefaults;
 
 /**
  * Represents all the options you can use to configure a backend Passwordless system.
  */
-@Value
+@Data
+@FieldDefaults(level = AccessLevel.PRIVATE)
+@RequiredArgsConstructor
+@AllArgsConstructor
 @Builder
 public class PasswordlessOptions {
     /**
      * Url to use for Passwordless API operations.
      */
-    @NonNull
     @Builder.Default
     String apiUrl = "https://v4.passwordless.dev";
 
@@ -19,5 +22,5 @@ public class PasswordlessOptions {
      * Secret API key used to authenticate with the Passwordless API.
      */
     @NonNull
-    String apiPrivateKey;
+    final String apiPrivateKey;
 }
diff --git a/src/main/java/com/bitwarden/passwordless/error/PasswordlessProblemDetails.java b/src/main/java/com/bitwarden/passwordless/error/PasswordlessProblemDetails.java
index 8bf5b6d..c92027a 100644
--- a/src/main/java/com/bitwarden/passwordless/error/PasswordlessProblemDetails.java
+++ b/src/main/java/com/bitwarden/passwordless/error/PasswordlessProblemDetails.java
@@ -1,6 +1,7 @@
 package com.bitwarden.passwordless.error;
 
 import lombok.*;
+import lombok.extern.jackson.Jacksonized;
 
 import java.util.List;
 import java.util.Map;
@@ -10,10 +11,10 @@
  *
  * @see <a href="https://docs.passwordless.dev/guide/errors.html#problem-details">Passwordless Docs Errors</a>
  */
-@Data
-@NoArgsConstructor(force = true, access = AccessLevel.PRIVATE)
+@Value
 @AllArgsConstructor
 @Builder
+@Jacksonized
 public class PasswordlessProblemDetails {
     String type;
     String title;
diff --git a/src/main/java/com/bitwarden/passwordless/model/Alias.java b/src/main/java/com/bitwarden/passwordless/model/Alias.java
index fb64d3e..7698e0b 100644
--- a/src/main/java/com/bitwarden/passwordless/model/Alias.java
+++ b/src/main/java/com/bitwarden/passwordless/model/Alias.java
@@ -1,11 +1,12 @@
 package com.bitwarden.passwordless.model;
 
 import lombok.*;
+import lombok.extern.jackson.Jacksonized;
 
-@Data
-@NoArgsConstructor(force = true, access = AccessLevel.PRIVATE)
+@Value
 @AllArgsConstructor
 @Builder
+@Jacksonized
 public class Alias {
     String userId;
     String alias;
diff --git a/src/main/java/com/bitwarden/passwordless/model/CreateAlias.java b/src/main/java/com/bitwarden/passwordless/model/CreateAlias.java
index 400e045..c877a78 100644
--- a/src/main/java/com/bitwarden/passwordless/model/CreateAlias.java
+++ b/src/main/java/com/bitwarden/passwordless/model/CreateAlias.java
@@ -1,17 +1,22 @@
 package com.bitwarden.passwordless.model;
 
 import lombok.*;
+import lombok.experimental.FieldDefaults;
+import lombok.extern.jackson.Jacksonized;
 
 import java.util.List;
 
 @Data
-@NoArgsConstructor(force = true, access = AccessLevel.PRIVATE)
+@FieldDefaults(level = AccessLevel.PRIVATE)
+@RequiredArgsConstructor
 @AllArgsConstructor
 @Builder
+@Jacksonized
 public class CreateAlias {
     @NonNull
-    String userId;
-    List<String> aliases;
+    final String userId;
+    @NonNull
+    final List<String> aliases;
     @Builder.Default
     Boolean hashing = true;
 }
diff --git a/src/main/java/com/bitwarden/passwordless/model/Credential.java b/src/main/java/com/bitwarden/passwordless/model/Credential.java
index 30328f0..d6624cb 100644
--- a/src/main/java/com/bitwarden/passwordless/model/Credential.java
+++ b/src/main/java/com/bitwarden/passwordless/model/Credential.java
@@ -1,14 +1,15 @@
 package com.bitwarden.passwordless.model;
 
 import lombok.*;
+import lombok.extern.jackson.Jacksonized;
 
 import java.time.LocalDateTime;
 import java.util.List;
 
-@Data
-@NoArgsConstructor(force = true, access = AccessLevel.PRIVATE)
+@Value
 @AllArgsConstructor
 @Builder
+@Jacksonized
 public class Credential {
     CredentialDescriptor descriptor;
     /**
diff --git a/src/main/java/com/bitwarden/passwordless/model/DeleteCredential.java b/src/main/java/com/bitwarden/passwordless/model/DeleteCredential.java
index d2c73d2..92b9337 100644
--- a/src/main/java/com/bitwarden/passwordless/model/DeleteCredential.java
+++ b/src/main/java/com/bitwarden/passwordless/model/DeleteCredential.java
@@ -1,11 +1,12 @@
 package com.bitwarden.passwordless.model;
 
 import lombok.*;
+import lombok.extern.jackson.Jacksonized;
 
-@Data
-@NoArgsConstructor(force = true, access = AccessLevel.PRIVATE)
+@Value
 @AllArgsConstructor
 @Builder
+@Jacksonized
 public class DeleteCredential {
     /**
      * Base64 encoded credential id.
diff --git a/src/main/java/com/bitwarden/passwordless/model/DeleteUser.java b/src/main/java/com/bitwarden/passwordless/model/DeleteUser.java
index c407131..d2ba705 100644
--- a/src/main/java/com/bitwarden/passwordless/model/DeleteUser.java
+++ b/src/main/java/com/bitwarden/passwordless/model/DeleteUser.java
@@ -1,11 +1,12 @@
 package com.bitwarden.passwordless.model;
 
 import lombok.*;
+import lombok.extern.jackson.Jacksonized;
 
-@Data
-@NoArgsConstructor(force = true, access = AccessLevel.PRIVATE)
+@Value
 @AllArgsConstructor
 @Builder
+@Jacksonized
 public class DeleteUser {
     @NonNull
     String userId;
diff --git a/src/main/java/com/bitwarden/passwordless/model/ListResponse.java b/src/main/java/com/bitwarden/passwordless/model/ListResponse.java
index ade5fc4..91dd519 100644
--- a/src/main/java/com/bitwarden/passwordless/model/ListResponse.java
+++ b/src/main/java/com/bitwarden/passwordless/model/ListResponse.java
@@ -1,13 +1,14 @@
 package com.bitwarden.passwordless.model;
 
 import lombok.*;
+import lombok.extern.jackson.Jacksonized;
 
 import java.util.List;
 
-@Data
-@NoArgsConstructor(force = true, access = AccessLevel.PRIVATE)
+@Value
 @AllArgsConstructor
 @Builder
+@Jacksonized
 public class ListResponse<T> {
     List<T> values;
 }
diff --git a/src/main/java/com/bitwarden/passwordless/model/RegisterToken.java b/src/main/java/com/bitwarden/passwordless/model/RegisterToken.java
index af4b5a3..f8e134d 100644
--- a/src/main/java/com/bitwarden/passwordless/model/RegisterToken.java
+++ b/src/main/java/com/bitwarden/passwordless/model/RegisterToken.java
@@ -1,20 +1,25 @@
 package com.bitwarden.passwordless.model;
 
 import lombok.*;
+import lombok.experimental.FieldDefaults;
+import lombok.extern.jackson.Jacksonized;
 
 import java.time.Instant;
 import java.util.Collections;
 import java.util.List;
 
 @Data
-@NoArgsConstructor(force = true, access = AccessLevel.PRIVATE)
+@FieldDefaults(level = AccessLevel.PRIVATE)
 @AllArgsConstructor
+@RequiredArgsConstructor
 @Builder
+@Jacksonized
 public class RegisterToken {
     @NonNull
-    String userId;
+    final String userId;
+    @NonNull
+    final String username;
     String displayName;
-    String username;
     @Builder.Default
     String attestation = "none";
     @Builder.Default
diff --git a/src/main/java/com/bitwarden/passwordless/model/RegisteredToken.java b/src/main/java/com/bitwarden/passwordless/model/RegisteredToken.java
index 1297057..0db7882 100644
--- a/src/main/java/com/bitwarden/passwordless/model/RegisteredToken.java
+++ b/src/main/java/com/bitwarden/passwordless/model/RegisteredToken.java
@@ -1,11 +1,12 @@
 package com.bitwarden.passwordless.model;
 
 import lombok.*;
+import lombok.extern.jackson.Jacksonized;
 
-@Data
-@NoArgsConstructor
+@Value
 @AllArgsConstructor
 @Builder
+@Jacksonized
 public class RegisteredToken {
     String token;
 }
diff --git a/src/main/java/com/bitwarden/passwordless/model/UpdateAppsFeature.java b/src/main/java/com/bitwarden/passwordless/model/UpdateAppsFeature.java
index b27b94f..c5c64af 100644
--- a/src/main/java/com/bitwarden/passwordless/model/UpdateAppsFeature.java
+++ b/src/main/java/com/bitwarden/passwordless/model/UpdateAppsFeature.java
@@ -1,11 +1,12 @@
 package com.bitwarden.passwordless.model;
 
 import lombok.*;
+import lombok.extern.jackson.Jacksonized;
 
-@Data
-@NoArgsConstructor(force = true, access = AccessLevel.PRIVATE)
+@Value
 @AllArgsConstructor
 @Builder
+@Jacksonized
 public class UpdateAppsFeature {
     Integer auditLoggingRetentionPeriod;
 }
diff --git a/src/main/java/com/bitwarden/passwordless/model/UserSummary.java b/src/main/java/com/bitwarden/passwordless/model/UserSummary.java
index 647da42..d4a4da6 100644
--- a/src/main/java/com/bitwarden/passwordless/model/UserSummary.java
+++ b/src/main/java/com/bitwarden/passwordless/model/UserSummary.java
@@ -1,14 +1,15 @@
 package com.bitwarden.passwordless.model;
 
 import lombok.*;
+import lombok.extern.jackson.Jacksonized;
 
 import java.time.LocalDateTime;
 import java.util.List;
 
-@Data
-@NoArgsConstructor(force = true, access = AccessLevel.PRIVATE)
+@Value
 @AllArgsConstructor
 @Builder
+@Jacksonized
 public class UserSummary {
     String userId;
     Integer aliasCount;
diff --git a/src/main/java/com/bitwarden/passwordless/model/VerifiedUser.java b/src/main/java/com/bitwarden/passwordless/model/VerifiedUser.java
index 1b21f3e..cb21eed 100644
--- a/src/main/java/com/bitwarden/passwordless/model/VerifiedUser.java
+++ b/src/main/java/com/bitwarden/passwordless/model/VerifiedUser.java
@@ -1,13 +1,14 @@
 package com.bitwarden.passwordless.model;
 
 import lombok.*;
+import lombok.extern.jackson.Jacksonized;
 
 import java.time.Instant;
 
-@Data
-@NoArgsConstructor(force = true, access = AccessLevel.PRIVATE)
+@Value
 @AllArgsConstructor
 @Builder
+@Jacksonized
 public class VerifiedUser {
     Boolean success;
     String userId;
diff --git a/src/main/java/com/bitwarden/passwordless/model/VerifySignIn.java b/src/main/java/com/bitwarden/passwordless/model/VerifySignIn.java
index b100239..4338cf9 100644
--- a/src/main/java/com/bitwarden/passwordless/model/VerifySignIn.java
+++ b/src/main/java/com/bitwarden/passwordless/model/VerifySignIn.java
@@ -1,11 +1,12 @@
 package com.bitwarden.passwordless.model;
 
 import lombok.*;
+import lombok.extern.jackson.Jacksonized;
 
-@Data
-@NoArgsConstructor(force = true, access = AccessLevel.PRIVATE)
+@Value
 @AllArgsConstructor
 @Builder
+@Jacksonized
 public class VerifySignIn {
     @NonNull
     String token;