lithic-com · stainless-app · Jun 17, 2026 · May 28, 2026 · May 28, 2026 · Jun 4, 2026
diff --git a/.release-please-manifest.json b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.15.0"
+  ".": "0.16.0"
 }
diff --git a/.stats.yml b/.stats.yml
@@ -1,4 +1,4 @@
-configured_endpoints: 195
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/lithic/lithic-efe780032e44b3cf0f6914407e43bce6aa7176fa50aa6ec018f93c1f28af8490.yml
-openapi_spec_hash: fcb4ca53ca59978f23f21d7c74fcc0b0
-config_hash: a0a579b0564a5c18568a78f5ba2b6653
+configured_endpoints: 214
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/lithic/lithic-a4afc884f86f30a87445552888031ac1ca18aed0476d7120da555bf457627e65.yml
+openapi_spec_hash: ce8d0830986c702f0c7a693b1c3cc5a2
+config_hash: 4b618a1df59e555cebe6aa13e8c0218f
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,5 +1,31 @@
 # Changelog
 
+## 0.16.0 (2026-06-16)
+
+Full Changelog: [v0.15.0...v0.16.0](https://github.com/lithic-com/lithic-ruby/compare/v0.15.0...v0.16.0)
+
+### Features
+
+* **api:** add CardTransactionFeature to auth_rules RuleFeature ([1071dc2](https://github.com/lithic-com/lithic-ruby/commit/1071dc23ec9899d915a1b6211ca2a876ab1b223d))
+* **api:** add condition attributes, interval/unit/scope to auth_rules ([28a4b65](https://github.com/lithic-com/lithic-ruby/commit/28a4b658b44f1aff6e6902fa6c7b32b0e4d2e197))
+* **api:** Add created field to Challenge object ([e442303](https://github.com/lithic-com/lithic-ruby/commit/e44230324af07930c8cc84b3035677df54bc031f))
+* **api:** add day_of_period field to loan_tape ([71ab28b](https://github.com/lithic-com/lithic-ruby/commit/71ab28b5af8e6118b2133bc8ed190520b6be2396))
+* **api:** add hold_adjustment_action variant to auth_rules action parameter ([bae640f](https://github.com/lithic-com/lithic-ruby/commit/bae640faf01eef0b956cb24eaa73f92c40536082))
+* **api:** add NVS name_validation fields to ASA request and response ([5747fda](https://github.com/lithic-com/lithic-ruby/commit/5747fda7c1065d257bc60d03e770f66be8677d48))
+* **api:** add route method to transactions ([74346e6](https://github.com/lithic-com/lithic-ruby/commit/74346e6f43f4c5153960d99954b7c120296c640f))
+* **api:** add tags field to Payment model ([745a6cd](https://github.com/lithic-com/lithic-ruby/commit/745a6cd3d832409fdcbbd191f06de40f7a8f2ecb))
+* **api:** add transaction_monitoring with cases/comments/files/queues, refactor entity_type ([37af713](https://github.com/lithic-com/lithic-ruby/commit/37af713a243f3380aea47019af34fe1d698bae35))
+
+
+### Bug Fixes
+
+* **client:** send content-type header for requests with an omitted optional body ([d5b5510](https://github.com/lithic-com/lithic-ruby/commit/d5b551022172beeeb6feccd1886a130ece8a9cc9))
+
+
+### Documentation
+
+* **api:** update support contact from email to URL in account/card resources ([bd7f679](https://github.com/lithic-com/lithic-ruby/commit/bd7f67927187e7daa99059f5e9190c1df79424c3))
+
 ## 0.15.0 (2026-05-27)
 
 Full Changelog: [v0.14.0...v0.15.0](https://github.com/lithic-com/lithic-ruby/compare/v0.14.0...v0.15.0)

diff --git a/Gemfile.lock b/Gemfile.lock
@@ -11,7 +11,7 @@ GIT
 PATH
   remote: .
   specs:
-    lithic (0.15.0)
+    lithic (0.16.0)
       cgi
       connection_pool
 

diff --git a/README.md b/README.md
@@ -24,7 +24,7 @@ To use this gem, install via Bundler by adding the following to your application
 <!-- x-release-please-start-version -->
 
 ```ruby
-gem "lithic", "~> 0.15.0"
+gem "lithic", "~> 0.16.0"
 ```
 
 <!-- x-release-please-end -->

diff --git a/lib/lithic.rb b/lib/lithic.rb
@@ -444,7 +444,42 @@
 require_relative "lithic/models/token_metadata"
 require_relative "lithic/models/transaction_expire_authorization_params"
 require_relative "lithic/models/transaction_list_params"
+require_relative "lithic/models/transaction_monitoring/case_activity_entry"
+require_relative "lithic/models/transaction_monitoring/case_activity_type"
+require_relative "lithic/models/transaction_monitoring/case_card"
+require_relative "lithic/models/transaction_monitoring/case_entity"
+require_relative "lithic/models/transaction_monitoring/case_list_activity_params"
+require_relative "lithic/models/transaction_monitoring/case_list_params"
+require_relative "lithic/models/transaction_monitoring/case_list_transactions_params"
+require_relative "lithic/models/transaction_monitoring/case_priority"
+require_relative "lithic/models/transaction_monitoring/case_retrieve_cards_params"
+require_relative "lithic/models/transaction_monitoring/case_retrieve_cards_response"
+require_relative "lithic/models/transaction_monitoring/case_retrieve_params"
+require_relative "lithic/models/transaction_monitoring/cases/case_file"
+require_relative "lithic/models/transaction_monitoring/cases/comment_create_params"
+require_relative "lithic/models/transaction_monitoring/cases/comment_delete_params"
+require_relative "lithic/models/transaction_monitoring/cases/comment_update_params"
+require_relative "lithic/models/transaction_monitoring/cases/file_create_params"
+require_relative "lithic/models/transaction_monitoring/cases/file_delete_params"
+require_relative "lithic/models/transaction_monitoring/cases/file_list_params"
+require_relative "lithic/models/transaction_monitoring/cases/file_retrieve_params"
+require_relative "lithic/models/transaction_monitoring/cases/file_status"
+require_relative "lithic/models/transaction_monitoring/cases/upload_constraints"
+require_relative "lithic/models/transaction_monitoring/case_sort_order"
+require_relative "lithic/models/transaction_monitoring/case_status"
+require_relative "lithic/models/transaction_monitoring/case_transaction"
+require_relative "lithic/models/transaction_monitoring/case_update_params"
+require_relative "lithic/models/transaction_monitoring/entity_type"
+require_relative "lithic/models/transaction_monitoring/monitoring_case"
+require_relative "lithic/models/transaction_monitoring/queue"
+require_relative "lithic/models/transaction_monitoring/queue_create_params"
+require_relative "lithic/models/transaction_monitoring/queue_delete_params"
+require_relative "lithic/models/transaction_monitoring/queue_list_params"
+require_relative "lithic/models/transaction_monitoring/queue_retrieve_params"
+require_relative "lithic/models/transaction_monitoring/queue_update_params"
+require_relative "lithic/models/transaction_monitoring/resolution_outcome"
 require_relative "lithic/models/transaction_retrieve_params"
+require_relative "lithic/models/transaction_route_params"
 require_relative "lithic/models/transactions/enhanced_commercial_data_retrieve_params"
 require_relative "lithic/models/transactions/enhanced_commercial_data_retrieve_response"
 require_relative "lithic/models/transactions/events/enhanced_commercial_data_retrieve_params"
@@ -525,6 +560,11 @@
 require_relative "lithic/resources/three_ds/decisioning"
 require_relative "lithic/resources/tokenization_decisioning"
 require_relative "lithic/resources/tokenizations"
+require_relative "lithic/resources/transaction_monitoring"
+require_relative "lithic/resources/transaction_monitoring/cases"
+require_relative "lithic/resources/transaction_monitoring/cases/comments"
+require_relative "lithic/resources/transaction_monitoring/cases/files"
+require_relative "lithic/resources/transaction_monitoring/queues"
 require_relative "lithic/resources/transactions"
 require_relative "lithic/resources/transactions/enhanced_commercial_data"
 require_relative "lithic/resources/transactions/events"

diff --git a/lib/lithic/client.rb b/lib/lithic/client.rb
@@ -35,6 +35,9 @@ class Client < Lithic::Internal::Transport::BaseClient
     # @return [Lithic::Resources::AuthRules]
     attr_reader :auth_rules
 
+    # @return [Lithic::Resources::TransactionMonitoring]
+    attr_reader :transaction_monitoring
+
     # @return [Lithic::Resources::AuthStreamEnrollment]
     attr_reader :auth_stream_enrollment
 
@@ -221,6 +224,7 @@ def initialize(
       @accounts = Lithic::Resources::Accounts.new(client: self)
       @account_holders = Lithic::Resources::AccountHolders.new(client: self)
       @auth_rules = Lithic::Resources::AuthRules.new(client: self)
+      @transaction_monitoring = Lithic::Resources::TransactionMonitoring.new(client: self)
       @auth_stream_enrollment = Lithic::Resources::AuthStreamEnrollment.new(client: self)
       @tokenization_decisioning = Lithic::Resources::TokenizationDecisioning.new(client: self)
       @tokenizations = Lithic::Resources::Tokenizations.new(client: self)

diff --git a/lib/lithic/internal/transport/base_client.rb b/lib/lithic/internal/transport/base_client.rb
@@ -306,7 +306,10 @@ def initialize(
               Lithic::Internal::Util.deep_merge(*[req[:body], opts[:extra_body]].compact)
             end
 
-          headers.delete("content-type") if body.nil?
+          # Generated methods always pass `req[:body]` for operations that define a
+          # request body, so only elide the content-type header when the operation
+          # has no body at all, not when an optional body param was omitted.
+          headers.delete("content-type") if body.nil? && !req.key?(:body)
 
           url = Lithic::Internal::Util.join_parsed_uri(
             @base_url_components,

diff --git a/lib/lithic/models.rb b/lib/lithic/models.rb
@@ -574,8 +574,12 @@ module Lithic
 
   TransactionListParams = Lithic::Models::TransactionListParams
 
+  TransactionMonitoring = Lithic::Models::TransactionMonitoring
+
   TransactionRetrieveParams = Lithic::Models::TransactionRetrieveParams
 
+  TransactionRouteParams = Lithic::Models::TransactionRouteParams
+
   Transactions = Lithic::Models::Transactions
 
   TransactionSimulateAuthorizationAdviceParams =

diff --git a/lib/lithic/models/account.rb b/lib/lithic/models/account.rb
@@ -38,7 +38,7 @@ class Account < Lithic::Internal::Type::BaseModel
       #     accounts are unable to be transitioned to `ACTIVE` or `PAUSED` states.
       #     Accounts can be manually set to `CLOSED`, or this can be done by Lithic due to
       #     failure to pass KYB/KYC or for risk/compliance reasons. Please contact
-      #     [support@lithic.com](mailto:support@lithic.com) if you believe this was done
+      #     [support.lithic.com](https://support.lithic.com/) if you believe this was done
       #     by mistake.
       #
       #   @return [Symbol, Lithic::Models::Account::State]
@@ -177,7 +177,7 @@ class SpendLimit < Lithic::Internal::Type::BaseModel
       #   accounts are unable to be transitioned to `ACTIVE` or `PAUSED` states.
       #   Accounts can be manually set to `CLOSED`, or this can be done by Lithic due to
       #   failure to pass KYB/KYC or for risk/compliance reasons. Please contact
-      #   [support@lithic.com](mailto:support@lithic.com) if you believe this was done
+      #   [support.lithic.com](https://support.lithic.com/) if you believe this was done
       #   by mistake.
       #
       # @see Lithic::Models::Account#state

diff --git a/lib/lithic/models/account_holders/account_holder_entity.rb b/lib/lithic/models/account_holders/account_holder_entity.rb
@@ -62,8 +62,8 @@ class AccountHolderEntity < Lithic::Internal::Type::BaseModel
         # @!attribute type
         #   The type of entity
         #
-        #   @return [Symbol, Lithic::Models::AccountHolders::AccountHolderEntity::Type]
-        required :type, enum: -> { Lithic::AccountHolders::AccountHolderEntity::Type }
+        #   @return [Symbol, Lithic::Models::TransactionMonitoring::EntityType]
+        required :type, enum: -> { Lithic::TransactionMonitoring::EntityType }
 
         # @!method initialize(token:, account_holder_token:, address:, dob:, email:, first_name:, last_name:, phone_number:, status:, type:)
         #   Information about an entity associated with an account holder
@@ -86,7 +86,7 @@ class AccountHolderEntity < Lithic::Internal::Type::BaseModel
         #
         #   @param status [Symbol, Lithic::Models::AccountHolders::AccountHolderEntity::Status] The status of the entity
         #
-        #   @param type [Symbol, Lithic::Models::AccountHolders::AccountHolderEntity::Type] The type of entity
+        #   @param type [Symbol, Lithic::Models::TransactionMonitoring::EntityType] The type of entity
 
         # @see Lithic::Models::AccountHolders::AccountHolderEntity#address
         class Address < Lithic::Internal::Type::BaseModel
@@ -162,19 +162,6 @@ module Status
           # @!method self.values
           #   @return [Array<Symbol>]
         end
-
-        # The type of entity
-        #
-        # @see Lithic::Models::AccountHolders::AccountHolderEntity#type
-        module Type
-          extend Lithic::Internal::Type::Enum
-
-          BENEFICIAL_OWNER_INDIVIDUAL = :BENEFICIAL_OWNER_INDIVIDUAL
-          CONTROL_PERSON = :CONTROL_PERSON
-
-          # @!method self.values
-          #   @return [Array<Symbol>]
-        end
       end
     end
 

diff --git a/lib/lithic/models/account_holders/entity_create_params.rb b/lib/lithic/models/account_holders/entity_create_params.rb
@@ -63,8 +63,8 @@ class EntityCreateParams < Lithic::Internal::Type::BaseModel
         # @!attribute type
         #   The type of entity to create on the account holder
         #
-        #   @return [Symbol, Lithic::Models::AccountHolders::EntityCreateParams::Type]
-        required :type, enum: -> { Lithic::AccountHolders::EntityCreateParams::Type }
+        #   @return [Symbol, Lithic::Models::TransactionMonitoring::EntityType]
+        required :type, enum: -> { Lithic::TransactionMonitoring::EntityType }
 
         # @!method initialize(account_holder_token:, address:, dob:, email:, first_name:, government_id:, last_name:, phone_number:, type:, request_options: {})
         #   Some parameter documentations has been truncated, see
@@ -86,7 +86,7 @@ class EntityCreateParams < Lithic::Internal::Type::BaseModel
         #
         #   @param phone_number [String] Individual's phone number, entered in E.164 format.
         #
-        #   @param type [Symbol, Lithic::Models::AccountHolders::EntityCreateParams::Type] The type of entity to create on the account holder
+        #   @param type [Symbol, Lithic::Models::TransactionMonitoring::EntityType] The type of entity to create on the account holder
         #
         #   @param request_options [Lithic::RequestOptions, Hash{Symbol=>Object}]
 
@@ -149,17 +149,6 @@ class Address < Lithic::Internal::Type::BaseModel
           #
           #   @param address2 [String] Unit or apartment number (if applicable).
         end
-
-        # The type of entity to create on the account holder
-        module Type
-          extend Lithic::Internal::Type::Enum
-
-          BENEFICIAL_OWNER_INDIVIDUAL = :BENEFICIAL_OWNER_INDIVIDUAL
-          CONTROL_PERSON = :CONTROL_PERSON
-
-          # @!method self.values
-          #   @return [Array<Symbol>]
-        end
       end
     end
   end

diff --git a/lib/lithic/models/auth_rules/auth_rule.rb b/lib/lithic/models/auth_rules/auth_rule.rb
@@ -84,7 +84,8 @@ class AuthRule < Lithic::Internal::Type::BaseModel
         #     ACH_CREDIT_RECEIPT, ACH_DEBIT_RECEIPT, or CARD_TRANSACTION_UPDATE event
         #     stream.
         #   - `TYPESCRIPT_CODE`: AUTHORIZATION, THREE_DS_AUTHENTICATION, TOKENIZATION,
-        #     ACH_CREDIT_RECEIPT, or ACH_DEBIT_RECEIPT event stream.
+        #     ACH_CREDIT_RECEIPT, ACH_DEBIT_RECEIPT, or CARD_TRANSACTION_UPDATE event
+        #     stream.
         #
         #   @return [Symbol, Lithic::Models::AuthRules::AuthRule::Type]
         required :type, enum: -> { Lithic::AuthRules::AuthRule::Type }
@@ -332,7 +333,8 @@ module State
         #   ACH_CREDIT_RECEIPT, ACH_DEBIT_RECEIPT, or CARD_TRANSACTION_UPDATE event
         #   stream.
         # - `TYPESCRIPT_CODE`: AUTHORIZATION, THREE_DS_AUTHENTICATION, TOKENIZATION,
-        #   ACH_CREDIT_RECEIPT, or ACH_DEBIT_RECEIPT event stream.
+        #   ACH_CREDIT_RECEIPT, ACH_DEBIT_RECEIPT, or CARD_TRANSACTION_UPDATE event
+        #   stream.
         #
         # @see Lithic::Models::AuthRules::AuthRule#type
         module Type