diff --git a/lib/payrix/configuration.rb b/lib/payrix/configuration.rb
index e3a63a6..54f4430 100644
--- a/lib/payrix/configuration.rb
+++ b/lib/payrix/configuration.rb
@@ -18,8 +18,16 @@ def environment=(environment)
       @environment = environment.to_sym
     end
 
-    def url
-      case @environment
+    def url(environment_override = nil)
+      environment = @environment
+
+      unless environment_override.nil?
+        validate_environment!(environment_override)
+
+        environment = environment_override
+      end
+
+      case environment
       when Payrix::MODES.fetch(:sandbox)
         'https://test-api.payrix.com'
       when Payrix::MODES.fetch(:production)
diff --git a/spec/lib/payrix/configuration_spec.rb b/spec/lib/payrix/configuration_spec.rb
index ef59547..97f239a 100644
--- a/spec/lib/payrix/configuration_spec.rb
+++ b/spec/lib/payrix/configuration_spec.rb
@@ -77,7 +77,7 @@
   end
 
   describe '#url' do
-    context 'when environment is not configured' do
+    context 'when environment is not configured and nothing is passed' do
       it 'returns the sandbox URL https://test-api.payrix.com' do
         configuration = described_class.new
 
@@ -85,7 +85,23 @@
       end
     end
 
-    context 'when environment is set to sandbox' do
+    context 'when environment is not configured and sandbox is passed' do
+      it 'returns the sandbox URL https://test-api.payrix.com' do
+        configuration = described_class.new
+
+        expect(configuration.url(:sandbox)).to eq('https://test-api.payrix.com')
+      end
+    end
+
+    context 'when environment is not configured and production is passed' do
+      it 'returns the production URL https://api.payrix.com' do
+        configuration = described_class.new
+
+        expect(configuration.url(:production)).to eq('https://api.payrix.com')
+      end
+    end
+
+    context 'when environment is set to sandbox and nothing is passed' do
       it 'returns the sandbox URL https://test-api.payrix.com' do
         configuration = described_class.new
 
@@ -95,7 +111,27 @@
       end
     end
 
-    context 'when environment is set to production' do
+    context 'when environment is set to sandbox and sandbox is passed' do
+      it 'returns the sandbox URL https://test-api.payrix.com' do
+        configuration = described_class.new
+
+        configuration.environment = :sandbox
+
+        expect(configuration.url(:sandbox)).to eq('https://test-api.payrix.com')
+      end
+    end
+
+    context 'when environment is set to sandbox and production is passed' do
+      it 'returns the production URL https://api.payrix.com' do
+        configuration = described_class.new
+
+        configuration.environment = :sandbox
+
+        expect(configuration.url(:production)).to eq('https://api.payrix.com')
+      end
+    end
+
+    context 'when environment is set to production and nothing is passed' do
       it 'returns the production URL https://api.payrix.com' do
         configuration = described_class.new
 
@@ -104,5 +140,25 @@
         expect(configuration.url).to eq('https://api.payrix.com')
       end
     end
+
+    context 'when environment is set to production and sandbox is passed' do
+      it 'returns the sandbox URL https://test-api.payrix.com' do
+        configuration = described_class.new
+
+        configuration.environment = :production
+
+        expect(configuration.url(:sandbox)).to eq('https://test-api.payrix.com')
+      end
+    end
+
+    context 'when environment is set to production and production is passed' do
+      it 'returns the production URL https://api.payrix.com' do
+        configuration = described_class.new
+
+        configuration.environment = :production
+
+        expect(configuration.url(:production)).to eq('https://api.payrix.com')
+      end
+    end
   end
 end