diff --git a/lib/mangopay.rb b/lib/mangopay.rb
index b512e23..fb1a794 100644
--- a/lib/mangopay.rb
+++ b/lib/mangopay.rb
@@ -49,6 +49,8 @@ module MangoPay
   # temporary
   autoload :Temp, 'mangopay/temp'
 
+  @configurations = {}
+
   class Configuration
     attr_accessor :preproduction, :root_url,
                   :client_id, :client_apiKey,
@@ -56,6 +58,20 @@ class Configuration
                   :http_max_retries, :http_open_timeout,
                   :logger, :use_ssl
 
+    def apply_configuration
+      MangoPay.configure do |config|
+        config.preproduction = @preproduction
+        config.client_id = @client_id
+        config.client_apiKey = @client_apiKey
+        config.log_file = @log_file
+        config.http_timeout = @http_timeout
+        config.http_max_retries = @http_max_retries
+        config.http_open_timeout = @http_open_timeout
+        config.use_ssl = @use_ssl
+        config.logger = @logger
+      end
+    end
+
     def preproduction
       @preproduction || false
     end
@@ -138,6 +154,23 @@ def ratelimit=(obj)
       @ratelimit = obj
     end
 
+    # Add MangoPay.Configuration to the list of configs
+    def add_config(name, config)
+      @configurations[name] = config
+    end
+
+    # Fetch a MangoPay configuration from the list of configs. Throw error if not found
+    def get_config(name)
+      config = @configurations[name]
+      raise "Could not find any configuration with name '#{name}'" unless config
+      config
+    end
+
+    def remove_config(name)
+      raise "Could not find any configuration with name '#{name}'" unless @configurations[name]
+      @configurations[name] = nil
+    end
+
     #
     # - +method+: HTTP method; lowercase symbol, e.g. :get, :post etc.
     # - +url+: the part after Configuration#root_url
diff --git a/spec/mangopay/configuration_spec.rb b/spec/mangopay/configuration_spec.rb
index 2b23ee7..51d34bd 100644
--- a/spec/mangopay/configuration_spec.rb
+++ b/spec/mangopay/configuration_spec.rb
@@ -13,6 +13,74 @@
       }
   end
 
+  it 'fails when calling with wrong client credentials, but succeeds after applying a new (correct) config' do
+    # create a wrong configuration
+    wrong_config = MangoPay::Configuration.new
+    wrong_config.client_id = 'placeholder'
+    wrong_config.client_apiKey = '0000'
+    wrong_config.preproduction = true
+
+    # create a valid configuration
+    valid_config = MangoPay::Configuration.new
+    valid_config.client_id = 'sdk-unit-tests'
+    valid_config.client_apiKey = 'cqFfFrWfCcb7UadHNxx2C9Lo6Djw8ZduLi7J9USTmu8bhxxpju'
+    valid_config.preproduction = true
+
+    # add the 2 configs to the list of MangoPay configs
+    MangoPay::add_config('wrong', wrong_config)
+    MangoPay::add_config('valid', valid_config)
+
+    # apply wrong config
+    MangoPay::get_config('wrong').apply_configuration
+
+    expect {
+      MangoPay::User.fetch()
+    }.to raise_error { |err|
+      expect(err).to be_a MangoPay::ResponseError
+      expect(err.code).to eq '401'
+      expect(err.message).to eq 'invalid_client'
+    }
+
+    # apply valid configuration
+    MangoPay::get_config('valid').apply_configuration
+
+    # expect success
+    users = MangoPay::User.fetch()
+    expect(users).to be_kind_of(Array)
+  end
+
+  it 'fails when fetching a config that does not exist' do
+    expect {
+      MangoPay::get_config('placeholder')
+    }.to raise_error { |err|
+      expect(err).to be_a RuntimeError
+      expect(err.message).to eq "Could not find any configuration with name 'placeholder'"
+    }
+  end
+
+  it 'succeeds when removing config' do
+    wrong_config = MangoPay::Configuration.new
+    wrong_config.client_id = 'placeholder'
+    wrong_config.client_apiKey = '0000'
+    wrong_config.preproduction = true
+
+    MangoPay::add_config('wrong', wrong_config)
+
+    # pass when fetching config before removing it
+    MangoPay::get_config('wrong')
+
+    # remove config
+    MangoPay::remove_config('wrong')
+
+    # fail when trying to fetch after removal
+    expect {
+      MangoPay::get_config('wrong')
+    }.to raise_error { |err|
+      expect(err).to be_a RuntimeError
+      expect(err.message).to eq "Could not find any configuration with name 'wrong'"
+    }
+  end
+
   it 'goes ok when calling with correct client credentials' do
     reset_mangopay_configuration
     users = MangoPay::User.fetch()