diff --git a/CHANGELOG.md b/CHANGELOG.md
index 43311e7..711fbd2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,11 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [unreleased]
-- See diff: https://github.com/barkibu/kb-ruby/compare/v0.25...HEAD
+- See diff: https://github.com/barkibu/kb-ruby/compare/v0.26...HEAD
+
+# [0.26.0]
+- Add `#iban` and `#update_iban` to `PetParent`
+- Add /iban endpoints in fake API
 
 # [0.25.0]
 - Add support for Ruby 3.2
diff --git a/Gemfile.lock b/Gemfile.lock
index 7878197..e7c21c5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    barkibu-kb (0.25.0)
+    barkibu-kb (0.26.0)
       activemodel (>= 4.0.2)
       activerecord
       activesupport (>= 3.0.0)
@@ -10,8 +10,8 @@ PATH
       faraday-http
       faraday_middleware
       i18n
-    barkibu-kb-fake (0.25.0)
-      barkibu-kb (= 0.25.0)
+    barkibu-kb-fake (0.26.0)
+      barkibu-kb (= 0.26.0)
       countries
       sinatra
       webmock
diff --git a/README.md b/README.md
index 113a5ff..739c969 100644
--- a/README.md
+++ b/README.md
@@ -74,6 +74,11 @@ KB.config.log_level = :debugger # :info by default
   - returns all the KB::Referral associated with this pet parent
 - `referrers`
   - returns all the KB::Referral associated with any of the pet parent's pets
+- `iban`
+  - returns the IBAN of the pet parent
+- `update_iban`
+  - arg: `iban` string
+  - updates the IBAN of the pet parent and reloads the entity
 
 #### Assessment 📄
 
diff --git a/lib/kb/fake/bounded_context/pet_family/pet_parents.rb b/lib/kb/fake/bounded_context/pet_family/pet_parents.rb
index 2b10f0f..944480d 100644
--- a/lib/kb/fake/bounded_context/pet_family/pet_parents.rb
+++ b/lib/kb/fake/bounded_context/pet_family/pet_parents.rb
@@ -15,6 +15,15 @@ def petparents_filterable_attributes
           KB::PetParent::FIELDS.map { |k| k.to_s.camelize(:lower) }
         end
 
+        def on_petparents_show(_version)
+          pet_parent = pet_parent_by_key(params).dup
+          return json_response 404, {} if pet_parent.nil?
+
+          pet_parent['iban_last4'] = pet_parent.delete('iban')&.chars&.last(4)&.join
+
+          json_response 200, pet_parent
+        end
+
         get '/v1/petparents/:key/pets' do
           json_response 200, pets_by_pet_parent_key(params['key'])
         end
@@ -70,6 +79,25 @@ def petparents_filterable_attributes
           json_response 200, resource
         end
 
+        get '/v1/petparents/:key/iban' do
+          pet_parent = pet_parent_by_key(params)
+          return json_response 404, {} if pet_parent.blank?
+
+          json_response 200, { iban: pet_parent['iban'] }
+        end
+
+        put '/v1/petparents/:key/iban' do
+          pet_parent = pet_parent_by_key(params)
+          return json_response 404, {} if pet_parent.blank?
+
+          body = JSON.parse(request.body.read)
+
+          updated_pet_parent = pet_parent.merge body.slice('iban')
+          update_resource_state(:petparents, updated_pet_parent)
+
+          json_response 200, { iban: updated_pet_parent['iban'] }
+        end
+
         private
 
         def pet_parent_by_key(params)
diff --git a/lib/kb/models/assessment.rb b/lib/kb/models/assessment.rb
index 6fc86bc..5daa030 100644
--- a/lib/kb/models/assessment.rb
+++ b/lib/kb/models/assessment.rb
@@ -30,6 +30,9 @@ def attributes_from_response(response)
       end
     end
 
+    STRING_FIELDS = %i[key pet_key urgency].freeze
+    FIELDS = [*STRING_FIELDS, :date, :should_stop, :finished, :conditions, :symptoms, :next_question].freeze
+
     # Legacy Field Name From Anamnesis
     alias_attribute :consultation_id, :key
     alias_attribute :should_stop, :finished
@@ -42,12 +45,7 @@ def attributes_from_response(response)
     attribute :date, :datetime
     attribute :finished, :boolean, default: false
 
-    attribute :urgency, :string
-    attribute :key, :string
-    attribute :pet_key, :string
-
-    STRING_FIELDS = %i[key pet_key urgency].freeze
-    FIELDS = [*STRING_FIELDS, :date, :should_stop, :finished, :conditions, :symptoms, :next_question].freeze
+    define_attributes STRING_FIELDS, :string
 
     def urgent
       return false if urgency == 'low'
diff --git a/lib/kb/models/base_model.rb b/lib/kb/models/base_model.rb
index 0b49985..51a3dfc 100644
--- a/lib/kb/models/base_model.rb
+++ b/lib/kb/models/base_model.rb
@@ -13,6 +13,23 @@ class BaseModel
 
     class << self
       delegate :clear_cache_for, to: :kb_client
+
+      def define_attribute_methods(*fields)
+        super
+        fields.each do |field|
+          define_method :"#{field}=" do |value|
+            super(value).tap do
+              public_send "#{field}_will_change!" if public_send("#{field}_changed?")
+            end
+          end
+        end
+      end
+
+      def define_attributes(attributes, cast_type = nil)
+        attributes.each do |attribute|
+          attribute attribute, cast_type&.to_sym
+        end
+      end
     end
 
     def initialize(attributes = {})
@@ -39,16 +56,5 @@ def ==(other)
         other.key == key)
     end
     alias eql? ==
-
-    def self.define_attribute_methods(*fields)
-      super
-      fields.each do |field|
-        define_method :"#{field}=" do |value|
-          super(value).tap do
-            public_send "#{field}_will_change!" if public_send("#{field}_changed?")
-          end
-        end
-      end
-    end
   end
 end
diff --git a/lib/kb/models/breed.rb b/lib/kb/models/breed.rb
index 9ea10d2..5af7051 100644
--- a/lib/kb/models/breed.rb
+++ b/lib/kb/models/breed.rb
@@ -32,8 +32,6 @@ def self.attributes_from_response(response)
 
     define_attribute_methods(*FIELDS)
 
-    STRING_FIELDS.each do |field|
-      attribute field, :string
-    end
+    define_attributes STRING_FIELDS, :string
   end
 end
diff --git a/lib/kb/models/concerns/findable.rb b/lib/kb/models/concerns/findable.rb
index 37c5ca6..ee55ac0 100644
--- a/lib/kb/models/concerns/findable.rb
+++ b/lib/kb/models/concerns/findable.rb
@@ -15,5 +15,11 @@ def find(key, params = {})
         raise KB::Error.from_faraday(e)
       end
     end
+
+    def reload
+      self.class.clear_cache_for(key)
+      self.attributes = self.class.find(key).attributes
+      self
+    end
   end
 end
diff --git a/lib/kb/models/hubspot_relationship.rb b/lib/kb/models/hubspot_relationship.rb
index 33bb006..48e52a1 100644
--- a/lib/kb/models/hubspot_relationship.rb
+++ b/lib/kb/models/hubspot_relationship.rb
@@ -16,13 +16,8 @@ def self.attributes_from_response(response)
 
     define_attribute_methods(*FIELDS)
 
-    STRING_FIELDS.each do |field|
-      attribute field, :string
-    end
-
-    DATE_FIELDS.each do |field|
-      attribute field, :date
-    end
+    define_attributes STRING_FIELDS, :string
+    define_attributes DATE_FIELDS, :date
 
     def self.find(model, model_key)
       response = kb_client.request("#{model}/#{model_key}/relationship")
diff --git a/lib/kb/models/pet.rb b/lib/kb/models/pet.rb
index 13556ee..cdf5e82 100644
--- a/lib/kb/models/pet.rb
+++ b/lib/kb/models/pet.rb
@@ -21,17 +21,9 @@ def self.attributes_from_response(response)
 
     define_attribute_methods(*FIELDS)
 
-    STRING_FIELDS.each do |field|
-      attribute field, :string
-    end
-
-    BOOLEAN_FIELDS.each do |field|
-      attribute field, :boolean
-    end
-
-    DATE_FIELDS.each do |field|
-      attribute field, :date
-    end
+    define_attributes STRING_FIELDS, :string
+    define_attributes DATE_FIELDS, :date
+    define_attributes BOOLEAN_FIELDS, :boolean
 
     def save!
       return unless changed?
diff --git a/lib/kb/models/pet_contract.rb b/lib/kb/models/pet_contract.rb
index 62e80f4..d42ba1d 100644
--- a/lib/kb/models/pet_contract.rb
+++ b/lib/kb/models/pet_contract.rb
@@ -31,17 +31,9 @@ def self.attributes_from_response(response)
 
     define_attribute_methods(*FIELDS)
 
-    STRING_FIELDS.each do |field|
-      attribute field, :string
-    end
-
-    DATE_FIELDS.each do |field|
-      attribute field, :date
-    end
-
-    INTEGER_FIELDS.each do |field|
-      attribute field, :integer
-    end
+    define_attributes STRING_FIELDS, :string
+    define_attributes DATE_FIELDS, :date
+    define_attributes INTEGER_FIELDS, :integer
 
     def save!
       return unless changed?
diff --git a/lib/kb/models/pet_parent.rb b/lib/kb/models/pet_parent.rb
index 9656818..d064617 100644
--- a/lib/kb/models/pet_parent.rb
+++ b/lib/kb/models/pet_parent.rb
@@ -41,8 +41,8 @@ def self.attributes_from_response(response)
 
     private_class_method :attributes_from_response
 
-    STRING_FIELDS = %i[key partner_name first_name last_name prefix_phone_number
-                       phone_number email country address zip_code nif affiliate_code city].freeze
+    STRING_FIELDS = %i[key partner_name first_name last_name prefix_phone_number phone_number email country address
+                       zip_code nif affiliate_code city iban_last4].freeze
     DATE_FIELDS = %i[birth_date deleted_at].freeze
     BOOLEAN_FIELDS = %i[phone_number_verified email_verified].freeze
     FIELDS = [*STRING_FIELDS, *DATE_FIELDS, *BOOLEAN_FIELDS].freeze
@@ -52,18 +52,9 @@ def self.attributes_from_response(response)
     alias phone_number_prefix prefix_phone_number
     alias phone_number_prefix= prefix_phone_number=
 
-    STRING_FIELDS.each do |field|
-      attribute field, :string
-    end
-
-    DATE_FIELDS.each do |field|
-      attribute field, :date
-    end
-
-    BOOLEAN_FIELDS.each do |field|
-      attribute field, :boolean
-    end
-
+    define_attributes STRING_FIELDS, :string
+    define_attributes DATE_FIELDS, :date
+    define_attributes BOOLEAN_FIELDS, :boolean
     attribute :first_name, :string, default: ''
 
     def save!
@@ -119,5 +110,18 @@ def referrers
         Referral.from_api(referral)
       end
     end
+
+    def iban
+      @iban ||= self.class.kb_client.request("#{key}/iban")['iban']
+    rescue Faraday::Error => e
+      raise KB::Error.from_faraday(e)
+    end
+
+    def update_iban(iban)
+      self.class.kb_client.request("#{key}/iban", filters: { iban: iban }, method: :put)
+      reload
+    rescue Faraday::Error => e
+      raise KB::Error.from_faraday(e)
+    end
   end
 end
diff --git a/lib/kb/models/plan.rb b/lib/kb/models/plan.rb
index 451f20d..301ae8c 100644
--- a/lib/kb/models/plan.rb
+++ b/lib/kb/models/plan.rb
@@ -19,13 +19,8 @@ def self.attributes_from_response(response)
     attribute :plan_life_in_months, :integer
     attribute :buyable, :boolean
 
-    STRING_FIELDS.each do |field|
-      attribute field, :string
-    end
-
-    HASH_FIELDS.each do |field|
-      attribute field
-    end
+    define_attributes STRING_FIELDS, :string
+    define_attributes HASH_FIELDS
 
     def save!
       return unless changed?
diff --git a/lib/kb/models/product.rb b/lib/kb/models/product.rb
index 2c600d6..33a5b06 100644
--- a/lib/kb/models/product.rb
+++ b/lib/kb/models/product.rb
@@ -23,12 +23,7 @@ def self.attributes_from_response(response)
 
     attribute :purchasable, :boolean
 
-    STRING_FIELDS.each do |field|
-      attribute field, :string
-    end
-
-    STRING_ARRAY_FIELDS.each do |field|
-      attribute field, :array_of_strings
-    end
+    define_attributes STRING_FIELDS, :string
+    define_attributes STRING_ARRAY_FIELDS, :array_of_strings
   end
 end
diff --git a/lib/kb/models/referral.rb b/lib/kb/models/referral.rb
index 75ab36c..cd97d34 100644
--- a/lib/kb/models/referral.rb
+++ b/lib/kb/models/referral.rb
@@ -16,13 +16,8 @@ def self.attributes_from_response(response)
 
     define_attribute_methods(*FIELDS)
 
-    STRING_FIELDS.each do |field|
-      attribute field, :string
-    end
-
-    DATE_FIELDS.each do |field|
-      attribute field, :date
-    end
+    define_attributes STRING_FIELDS, :string
+    define_attributes DATE_FIELDS, :date
 
     def self.create(pet_parent_key, attributes)
       response = kb_client.request("#{pet_parent_key}/referrals", filters: attributes, method: :post)
diff --git a/lib/kb/version.rb b/lib/kb/version.rb
index d35ba1a..ecb67ad 100644
--- a/lib/kb/version.rb
+++ b/lib/kb/version.rb
@@ -1,3 +1,3 @@
 module KB
-  VERSION = '0.25.0'.freeze
+  VERSION = '0.26.0'.freeze
 end
diff --git a/spec/fake/models/pet_parent_spec.rb b/spec/fake/models/pet_parent_spec.rb
index d32fe88..ba90b53 100644
--- a/spec/fake/models/pet_parent_spec.rb
+++ b/spec/fake/models/pet_parent_spec.rb
@@ -168,4 +168,48 @@
       end
     end
   end
+
+  describe '#iban_last4' do
+    context 'with an existing pet parent' do
+      let(:pet_parent) { described_class.new described_class.create }
+
+      context 'with no iban' do
+        it 'returns nil' do
+          expect(pet_parent.iban_last4).to be_nil
+        end
+      end
+
+      context 'with an iban' do
+        before do
+          pet_parent.update_iban('ES9121000418450200051332')
+        end
+
+        it 'returns the last 4 digits from the iban of the pet parent' do
+          expect(pet_parent.iban_last4).to eq('1332')
+        end
+      end
+    end
+  end
+
+  describe '#iban' do
+    context 'with an existing pet parent' do
+      let(:pet_parent) { described_class.new described_class.create }
+
+      context 'with no iban' do
+        it 'returns nil' do
+          expect(pet_parent.iban).to be_nil
+        end
+      end
+
+      context 'with an iban' do
+        before do
+          pet_parent.update_iban('ES9121000418450200051332')
+        end
+
+        it 'returns the iban of the pet parent' do
+          expect(pet_parent.iban).to eq('ES9121000418450200051332')
+        end
+      end
+    end
+  end
 end
diff --git a/spec/models/pet_parent_spec.rb b/spec/models/pet_parent_spec.rb
index 6821dd1..7ae6dc5 100644
--- a/spec/models/pet_parent_spec.rb
+++ b/spec/models/pet_parent_spec.rb
@@ -3,12 +3,12 @@
 RSpec.describe KB::PetParent do
   let(:base_url) { 'https://test_api_barkkb.com/v1' }
 
+  let(:pet_parent) { described_class.new(key: pet_parent_key) }
+  let(:pet_parent_key) { 'pet_parent_key' }
+
   describe '#referrals' do
     subject(:referrals) { pet_parent.referrals }
 
-    let(:pet_parent) { described_class.new(key: pet_parent_key) }
-    let(:pet_parent_key) { 'pet_parent_key' }
-
     context 'when no referrals exist for pet parent' do
       before do
         stub_request(:get, "#{base_url}/petparents/#{pet_parent_key}/referrals")
@@ -76,8 +76,6 @@
   describe '#referrers' do
     subject(:referrers) { pet_parent.referrers }
 
-    let(:pet_parent) { described_class.new(key: pet_parent_key) }
-    let(:pet_parent_key) { 'pet_parent_key' }
     let(:referrer_pet_parent_key) { 'referrer_pet_parent_key' }
 
     context 'when no referrers exist for pet parent' do
@@ -143,4 +141,45 @@
       end
     end
   end
+
+  describe '#iban' do
+    subject(:iban) { pet_parent.iban }
+
+    before do
+      stub_request(:get, "#{base_url}/petparents/#{pet_parent_key}/iban")
+        .to_return(status: 200, body: { iban: 'DE89370400440532013000' }.to_json)
+    end
+
+    it 'GETs the iban from the endpoint' do
+      iban
+      expect(a_request(:get, "#{base_url}/petparents/#{pet_parent_key}/iban")).to have_been_made
+    end
+  end
+
+  describe '#update_iban' do
+    subject(:update_iban) { pet_parent.update_iban(new_iban) }
+
+    let(:new_iban) { 'DE89370400440532013000' }
+
+    before do
+      stub_request(:put, "#{base_url}/petparents/#{pet_parent_key}/iban")
+        .to_return(status: 200, body: { iban: new_iban }.to_json)
+
+      stub_request(:get, "#{base_url}/petparents/#{pet_parent_key}")
+        .to_return(status: 200, body: pet_parent.attributes.to_json)
+
+      allow(pet_parent).to receive(:reload).and_call_original
+    end
+
+    it 'PUTs the iban in the endpoint' do
+      update_iban
+      expect(a_request(:put, "#{base_url}/petparents/#{pet_parent_key}/iban").with(body: { iban: new_iban }.to_json))
+        .to have_been_made
+    end
+
+    it 'reloads the pet parent' do
+      update_iban
+      expect(pet_parent).to have_received(:reload)
+    end
+  end
 end