diff --git a/CHANGELOG.md b/CHANGELOG.md
index 410aec9..3cd3227 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,32 @@
-## [Unreleased]
+# Changelog
 
-## [0.1.0] - 2025-02-05
+## [0.1.4] - 2025-08-13
+### Added
+- **Tax API** support:
+  - `delete_by_id`
+  - `delete_by_keys`
+  - `get_ad_hoc_schema`
+  - `get_by_id`
+  - `get_by_keys`
+  - `get_list`
+  - `invoke_action`
+  - `put_entity`
+  - `put_file`
 
-- Initial release
+## [0.1.3] - 2025-08-10
+### Added
+- **Payment API** support:
+  - `delete_by_id`
+  - `delete_by_keys`
+  - `get_ad_hoc_schema`
+  - `get_by_id`
+  - `get_by_keys`
+  - `get_list`
+  - `put_entity`
+  - `put_file`
+  - `invoke_action`
+  - `capture_credit_card_payment`
+  - `card_operation`
+  - `release_payment`
+  - `void_card_payment`
+  - `void_payment`
diff --git a/Gemfile.lock b/Gemfile.lock
index 779f3d2..a55cea4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    myob_acumatica (0.1.2)
+    myob_acumatica (0.1.4)
 
 GEM
   remote: https://rubygems.org/
diff --git a/examples/tax.rb b/examples/tax.rb
new file mode 100644
index 0000000..d4eab67
--- /dev/null
+++ b/examples/tax.rb
@@ -0,0 +1,99 @@
+# frozen_string_literal: true
+
+require 'json'
+require 'logger'
+require 'date'
+require 'dotenv/load'
+require 'myob_acumatica'
+
+access_token = ENV['MYOB_ACUMATICA_ACCESS_TOKEN']
+logger = Logger.new($stdout)
+
+MyobAcumatica::Api::Tax.get_ad_hoc_schema(
+  access_token: access_token,
+  logger: logger
+)
+
+gst = MyobAcumatica::Api::Tax.put_entity(
+  access_token: access_token,
+  entity: {
+    'TaxID' => { 'value' => 'GST' },
+    'Description' => { 'value' => 'Goods and Services Tax' },
+    'TaxType' => { 'value' => 'Sales' },
+    'CalculateOn' => { 'value' => 'Exclusive Document-Level' },
+    'TaxAgency' => { 'value' => 'ATO' },
+    'TaxPayableAccount' => { 'value' => '2200' },
+    'TaxPayableSubaccount' => { 'value' => '000-000' }
+  },
+  logger: logger
+)
+
+vat = MyobAcumatica::Api::Tax.put_entity(
+  access_token: access_token,
+  entity: {
+    'TaxID' => { 'value' => 'VAT20' },
+    'Description' => { 'value' => 'Value Added Tax 20%' },
+    'TaxType' => { 'value' => 'Sales' },
+    'CalculateOn' => { 'value' => 'Exclusive Document-Level' },
+    'TaxAgency' => { 'value' => 'ATO' },
+    'TaxPayableAccount' => { 'value' => '2200' },
+    'TaxPayableSubaccount' => { 'value' => '000-000' }
+  },
+  logger: logger
+)
+
+puts "Created GST with id=#{gst['id']}"
+puts "Created VAT20 with id=#{vat['id']}"
+
+gst_by_keys = MyobAcumatica::Api::Tax.get_by_keys(
+  access_token: access_token,
+  keys: ['GST'],
+  logger: logger
+)
+puts "Fetched by keys: #{gst_by_keys['TaxID']&.dig('value')}"
+
+gst_by_id = MyobAcumatica::Api::Tax.get_by_id(
+  access_token: access_token,
+  id: gst['id'],
+  logger: logger
+)
+puts "Fetched by id: #{gst_by_id['TaxID']&.dig('value')}"
+
+list = MyobAcumatica::Api::Tax.get_list(
+  access_token: access_token,
+  query_params: { '$filter' => "TaxType eq 'Sales'", '$top' => 5 },
+  logger: logger
+)
+puts "Listed #{list.size} tax record(s)"
+
+gst = MyobAcumatica::Api::Tax.put_entity(
+  access_token: access_token,
+  entity: {
+    'id' => gst['id'],
+    'Description' => { 'value' => 'GST (updated desc)' }
+  },
+  logger: logger
+)
+puts 'Updated GST description'
+
+MyobAcumatica::Api::Tax.put_file(
+  access_token: access_token,
+  keys: ['GST'],
+  file_path: 'examples/dummy.pdf',
+  logger: logger
+)
+puts 'Attached file to GST'
+
+MyobAcumatica::Api::Tax.delete_by_keys(
+  access_token: access_token,
+  keys: ['VAT20'],
+  logger: logger
+)
+puts 'Deleted VAT20 by keys'
+
+MyobAcumatica::Api::Tax.delete_by_id(
+  access_token: access_token,
+  id: gst['id'],
+  logger: logger
+)
+puts 'Deleted GST by id'
diff --git a/lib/myob_acumatica.rb b/lib/myob_acumatica.rb
index aabd18e..ea2ded8 100644
--- a/lib/myob_acumatica.rb
+++ b/lib/myob_acumatica.rb
@@ -28,3 +28,4 @@ class Error < StandardError; end
 require_relative 'myob_acumatica/api/customer'
 require_relative 'myob_acumatica/api/invoice'
 require_relative 'myob_acumatica/api/payment'
+require_relative 'myob_acumatica/api/tax'
diff --git a/lib/myob_acumatica/api/tax.rb b/lib/myob_acumatica/api/tax.rb
new file mode 100644
index 0000000..607ff3a
--- /dev/null
+++ b/lib/myob_acumatica/api/tax.rb
@@ -0,0 +1,350 @@
+# frozen_string_literal: true
+
+module MyobAcumatica
+  module Api
+    # Provides methods to interact with the Tax API endpoints.
+    module Tax
+      module_function
+
+      ##
+      # Deletes a tax record by its session UUID.
+      #
+      # @example Delete a tax by ID
+      #   MyobAcumatica::Api::Tax.delete_by_id(
+      #     access_token: access_token,
+      #     id: tax['id'],
+      #     logger: logger
+      #   )
+      #
+      # @param access_token [String] OAuth2 access token.
+      # @param id [String] Session UUID of the tax record.
+      # @param instance_name [String] The instance name.
+      # @param endpoint_name [String] The endpoint name.
+      # @param endpoint_version [String] The endpoint version.
+      # @param logger [Logger, nil] Optional logger.
+      # @return [nil]
+      def delete_by_id(access_token:, id:,
+                       instance_name: INSTANCE_NAME,
+                       endpoint_name: ENDPOINT_NAME,
+                       endpoint_version: ENDPOINT_VERSION,
+                       logger: nil)
+        Http.request(
+          instance_name: instance_name,
+          access_token: access_token,
+          method: :delete,
+          endpoint_name: endpoint_name,
+          endpoint_version: endpoint_version,
+          path: "Tax/#{id}",
+          logger: logger
+        )
+      end
+
+      ##
+      # Deletes a tax record by composite keys.
+      #
+      # Keys are ordered values of the record's key fields. For Tax this is
+      # typically the TaxID (and if applicable, other key parts defined by the
+      # endpoint contract).
+      #
+      # @example Delete a tax by keys
+      #   MyobAcumatica::Api::Tax.delete_by_keys(
+      #     access_token: access_token,
+      #     keys: [tax['TaxID']['value']],
+      #     logger: logger
+      #   )
+      #
+      # @param access_token [String] OAuth2 access token.
+      # @param keys [Array<String>] Key values identifying the tax record.
+      # @param instance_name [String] The instance name.
+      # @param endpoint_name [String] The endpoint name.
+      # @param endpoint_version [String] The endpoint version.
+      # @param logger [Logger, nil] Optional logger.
+      # @return [nil]
+      def delete_by_keys(access_token:, keys:,
+                         instance_name: INSTANCE_NAME,
+                         endpoint_name: ENDPOINT_NAME,
+                         endpoint_version: ENDPOINT_VERSION,
+                         logger: nil)
+        Http.request(
+          instance_name: instance_name,
+          access_token: access_token,
+          method: :delete,
+          endpoint_name: endpoint_name,
+          endpoint_version: endpoint_version,
+          path: "Tax/#{keys.join('/')}",
+          logger: logger
+        )
+      end
+
+      ##
+      # Retrieves the ad-hoc schema (custom fields) for the Tax entity.
+      #
+      # @example Retrieve ad-hoc schema
+      #   MyobAcumatica::Api::Tax.get_ad_hoc_schema(
+      #     access_token: access_token,
+      #     logger: logger
+      #   )
+      #
+      # @param access_token [String] OAuth2 access token.
+      # @param instance_name [String] The instance name.
+      # @param endpoint_name [String] The endpoint name.
+      # @param endpoint_version [String] The endpoint version.
+      # @param logger [Logger, nil] Optional logger.
+      # @return [Hash] Ad-hoc schema payload.
+      def get_ad_hoc_schema(access_token:,
+                            instance_name: INSTANCE_NAME,
+                            endpoint_name: ENDPOINT_NAME,
+                            endpoint_version: ENDPOINT_VERSION,
+                            logger: nil)
+        Http.request(
+          instance_name: instance_name,
+          access_token: access_token,
+          method: :get,
+          endpoint_name: endpoint_name,
+          endpoint_version: endpoint_version,
+          path: 'Tax/$adHocSchema',
+          logger: logger
+        )
+      end
+
+      ##
+      # Retrieves a tax record by its session UUID.
+      #
+      # @example Get tax by ID
+      #   MyobAcumatica::Api::Tax.get_by_id(
+      #     access_token: access_token,
+      #     id: tax['id'],
+      #     logger: logger
+      #   )
+      #
+      # @param access_token [String] OAuth2 access token.
+      # @param id [String] Session UUID of the tax record.
+      # @param query_params [Hash] Optional query params ($select, $expand, $filter,
+      #   $custom).
+      # @param instance_name [String] The instance name.
+      # @param endpoint_name [String] The endpoint name.
+      # @param endpoint_version [String] The endpoint version.
+      # @param logger [Logger, nil] Optional logger.
+      # @return [Hash] The tax record.
+      def get_by_id(access_token:, id:, query_params: {},
+                    instance_name: INSTANCE_NAME,
+                    endpoint_name: ENDPOINT_NAME,
+                    endpoint_version: ENDPOINT_VERSION,
+                    logger: nil)
+        Http.request(
+          instance_name: instance_name,
+          access_token: access_token,
+          method: :get,
+          endpoint_name: endpoint_name,
+          endpoint_version: endpoint_version,
+          path: "Tax/#{id}",
+          query_params: query_params,
+          logger: logger
+        )
+      end
+
+      ##
+      # Retrieves a tax record by composite keys.
+      #
+      # @example Get tax by keys
+      #   MyobAcumatica::Api::Tax.get_by_keys(
+      #     access_token: access_token,
+      #     keys: [tax_id],
+      #     logger: logger
+      #   )
+      #
+      # @param access_token [String] OAuth2 access token.
+      # @param keys [Array<String>] Key values identifying the tax record.
+      # @param query_params [Hash] Optional query params ($select, $expand, $filter,
+      #   $custom).
+      # @param instance_name [String] The instance name.
+      # @param endpoint_name [String] The endpoint name.
+      # @param endpoint_version [String] The endpoint version.
+      # @param logger [Logger, nil] Optional logger.
+      # @return [Hash] The tax record.
+      def get_by_keys(access_token:, keys:, query_params: {},
+                      instance_name: INSTANCE_NAME,
+                      endpoint_name: ENDPOINT_NAME,
+                      endpoint_version: ENDPOINT_VERSION,
+                      logger: nil)
+        Http.request(
+          instance_name: instance_name,
+          access_token: access_token,
+          method: :get,
+          endpoint_name: endpoint_name,
+          endpoint_version: endpoint_version,
+          path: "Tax/#{keys.join('/')}",
+          query_params: query_params,
+          logger: logger
+        )
+      end
+
+      ##
+      # Retrieves a list of tax records with optional filtering and paging.
+      #
+      # @example List tax records with a filter
+      #   MyobAcumatica::Api::Tax.get_list(
+      #     access_token: access_token,
+      #     query_params: { '$filter' => 'TaxType eq 'Sales'' },
+      #     logger: logger
+      #   )
+      #
+      # @param access_token [String] OAuth2 access token.
+      # @param query_params [Hash] Optional query params ($select, $expand, $filter,
+      #   $custom, $skip, $top).
+      # @param instance_name [String] The instance name.
+      # @param endpoint_name [String] The endpoint name.
+      # @param endpoint_version [String] The endpoint version.
+      # @param logger [Logger, nil] Optional logger.
+      # @return [Array<Hash>] List of tax records.
+      def get_list(access_token:, query_params: {},
+                   instance_name: INSTANCE_NAME,
+                   endpoint_name: ENDPOINT_NAME,
+                   endpoint_version: ENDPOINT_VERSION,
+                   logger: nil)
+        Http.request(
+          instance_name: instance_name,
+          access_token: access_token,
+          method: :get,
+          endpoint_name: endpoint_name,
+          endpoint_version: endpoint_version,
+          path: 'Tax',
+          query_params: query_params,
+          logger: logger
+        )
+      end
+
+      ##
+      # Invokes a custom action on a tax record.
+      #
+      # @example Invoke a custom action
+      #   MyobAcumatica::Api::Tax.invoke_action(
+      #     access_token: access_token,
+      #     action_name: 'Recalculate',
+      #     entity: { 'id' => tax['id'] },
+      #     parameters: {},
+      #     logger: logger
+      #   )
+      #
+      # @param access_token [String] OAuth2 access token.
+      # @param action_name [String] The action name to invoke.
+      # @param entity [Hash] Tax entity payload (e.g., { 'id' => uuid }).
+      # @param parameters [Hash] Optional parameters for the action.
+      # @param instance_name [String] The instance name.
+      # @param endpoint_name [String] The endpoint name.
+      # @param endpoint_version [String] The endpoint version.
+      # @param logger [Logger, nil] Optional logger.
+      # @return [Hash, nil] Action response or nil on 204.
+      def invoke_action(access_token:, action_name:, entity:, parameters: {},
+                        instance_name: INSTANCE_NAME,
+                        endpoint_name: ENDPOINT_NAME,
+                        endpoint_version: ENDPOINT_VERSION,
+                        logger: nil)
+        Http.request(
+          instance_name: instance_name,
+          access_token: access_token,
+          method: :post,
+          endpoint_name: endpoint_name,
+          endpoint_version: endpoint_version,
+          path: "Tax/#{action_name}",
+          body: { 'entity' => entity, 'parameters' => parameters },
+          logger: logger
+        )
+      end
+
+      ##
+      # Creates or updates a tax record.
+      #
+      # @example Create or update a tax
+      #   tax = MyobAcumatica::Api::Tax.put_entity(
+      #     access_token: access_token,
+      #     entity: {
+      #       'TaxID' => { 'value' => 'GST' },
+      #       'Description' => { 'value' => 'Goods and Services Tax' }
+      #     },
+      #     logger: logger
+      #   )
+      #
+      # @param access_token [String] OAuth2 access token.
+      # @param entity [Hash] Tax entity payload.
+      # @param query_params [Hash] Optional query params ($select, $expand, $filter,
+      #   $custom).
+      # @param instance_name [String] The instance name.
+      # @param endpoint_name [String] The endpoint name.
+      # @param endpoint_version [String] The endpoint version.
+      # @param logger [Logger, nil] Optional logger.
+      # @return [Hash] The created or updated tax record.
+      def put_entity(access_token:, entity:, query_params: {},
+                     instance_name: INSTANCE_NAME,
+                     endpoint_name: ENDPOINT_NAME,
+                     endpoint_version: ENDPOINT_VERSION,
+                     logger: nil)
+        Http.request(
+          instance_name: instance_name,
+          access_token: access_token,
+          method: :put,
+          endpoint_name: endpoint_name,
+          endpoint_version: endpoint_version,
+          path: 'Tax',
+          body: entity,
+          query_params: query_params,
+          logger: logger
+        )
+      end
+
+      ##
+      # Attaches a file to a tax record. Uses the entity's files:put link to
+      # construct the upload path, then uploads the binary content.
+      #
+      # @example Upload a file to a tax record
+      #   MyobAcumatica::Api::Tax.put_file(
+      #     access_token: access_token,
+      #     keys: [tax['TaxID']['value']],
+      #     file_path: 'examples/rate-sheet.pdf',
+      #     logger: logger
+      #   )
+      #
+      # @param access_token [String] OAuth2 access token.
+      # @param keys [Array<String>] Key values identifying the tax record.
+      # @param file_path [String] Absolute or relative path to the file.
+      # @param instance_name [String] The instance name.
+      # @param endpoint_name [String] The endpoint name.
+      # @param endpoint_version [String] The endpoint version.
+      # @param logger [Logger, nil] Optional logger.
+      # @raise [MyobAcumatica::Error] If the files:put link is not present.
+      # @return [nil]
+      def put_file(access_token:, keys:, file_path:,
+                   instance_name: INSTANCE_NAME,
+                   endpoint_name: ENDPOINT_NAME,
+                   endpoint_version: ENDPOINT_VERSION,
+                   logger: nil)
+        entity = get_by_keys(
+          access_token: access_token,
+          keys: keys,
+          instance_name: instance_name,
+          endpoint_name: endpoint_name,
+          endpoint_version: endpoint_version,
+          logger: logger
+        )
+
+        put_template = entity.dig('_links', 'files:put')
+        raise MyobAcumatica::Error, 'files:put link not found' unless put_template
+
+        filename = File.basename(file_path)
+        path = put_template.gsub('{filename}', filename)
+
+        Http.request(
+          instance_name: instance_name,
+          access_token: access_token,
+          method: :put,
+          endpoint_name: endpoint_name,
+          endpoint_version: endpoint_version,
+          path: path,
+          body: File.binread(file_path),
+          content_type: 'application/octet-stream',
+          logger: logger
+        )
+      end
+    end
+  end
+end
diff --git a/lib/myob_acumatica/version.rb b/lib/myob_acumatica/version.rb
index 07e4eb2..e870023 100644
--- a/lib/myob_acumatica/version.rb
+++ b/lib/myob_acumatica/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module MyobAcumatica
-  VERSION = '0.1.3'
+  VERSION = '0.1.4'
 end