diff --git a/API-REFERENCE.md b/API-REFERENCE.md
index a60c6dc..67b19bb 100644
--- a/API-REFERENCE.md
+++ b/API-REFERENCE.md
@@ -50,7 +50,8 @@ func main() {
 func NewCarboneSDK(SecretAccessToken ...string) (*CSDK, error)
 ```
 Function to create a new instance of CSDK (CarboneSDK).
-The access token can be pass as an argument to NewCarboneSDK (`args[0]`) or by the environment variable "CARBONE_TOKEN".
+The access token can be pass as the first argument to NewCarboneSDK (`args[0]`) or by the environment variable "CARBONE_TOKEN".
+The Api URL can be pass the second argument (`args[1]`) or by the environment variable "CARBONE_URL".
 To set a new environment variable, use the command:
 ```bash
 $ export CARBONE_TOKEN=your-secret-token
@@ -65,6 +66,8 @@ Example
 csdk, err := carbone.NewCarboneSDK("YOUR-ACCESS-TOKEN")
 // Carbone access token passed as environment variable "Carbone TOKEN"
 csdk, err := carbone.NewCarboneSDK()
+// Carbone access token passed as parameter with a custom API URL as second parameter
+csdk, err := carbone.NewCarboneSDK("TOKEN", "https://test.carbone.io")
 ```
 ### Render
 ```go
diff --git a/CHANGELOG.md b/CHANGELOG.md
index bb1550c..883aeaf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+### v1.2.0
+ - The API key is not blocking the instantiation and is not required anymore as an environment variable nor as the first argument of the constructor. Nevertheless, A warning message is printed if the key is missing.
+ - A custom API url can be passed a second argument of the `NewCarboneSDK` function, or it can be passed as environment varible `CARBONE_URL`
+
 ### v1.1.0
  - Updated Carbone default API version to 4
  - Increased default timeout to 60 seconds
diff --git a/README.md b/README.md
index e64187b..4144891 100644
--- a/README.md
+++ b/README.md
@@ -62,14 +62,6 @@ First, Go to the `carbone` package directory.
 ```bash
 $ cd carbone
 ```
-Then, create an environment variable `CARBONE_TOKEN` with the Carbone access token as value:
-```bash
-$ export CARBONE_TOKEN="YOUR_ACCESS_TOKEN"
-```
-Check if it is set by running:
-```bash
-$ printenv | grep "CARBONE_TOKEN"
-```
 To run all the tests (-v for verbose output):
 ```bash
 $ go test -v
diff --git a/carbone/carbone.go b/carbone/carbone.go
index 894ff89..7b1faf5 100644
--- a/carbone/carbone.go
+++ b/carbone/carbone.go
@@ -46,17 +46,24 @@ type CSDK struct {
 
 // NewCarboneSDK is a constructor and return a new instance of CSDK
 func NewCarboneSDK(args ...string) (*CSDK, error) {
+	apiURL := os.Getenv("CARBONE_URL")
 	apiAccessToken := os.Getenv("CARBONE_TOKEN")
 	if len(args) > 0 && args[0] != "" {
 		apiAccessToken = args[0]
 	}
 	if apiAccessToken == "" {
-		return nil, errors.New(`NewCarboneSDK error: "apiAccessToken" argument OR "CARBONE_TOKEN" env variable is missing`)
+		fmt.Println(`Carbone SDK Warning: Cloud API access token and "CARBONE_TOKEN" env variable are missing`)
+	}
+	if len(args) > 0 && args[1] != "" {
+		apiURL = args[1]
+	}
+	if apiURL == "" {
+		apiURL = "https://api.carbone.io"
 	}
 	csdk := &CSDK{
 		apiVersion:     "4",
 		apiAccessToken: apiAccessToken,
-		apiURL:         "https://api.carbone.io",
+		apiURL:         apiURL,
 		apiTimeOut:     time.Second * 60,
 		apiHTTPClient:  &http.Client{Timeout: time.Second * 60},
 	}
diff --git a/carbone/carbone_test.go b/carbone/carbone_test.go
index 76d741c..4d51e01 100644
--- a/carbone/carbone_test.go
+++ b/carbone/carbone_test.go
@@ -25,6 +25,56 @@ func TestMain(m *testing.M) {
 	os.Exit(status)
 }
 
+func TestDefaultConfig (t *testing.T) {
+	t.Run("Should get a default config", func (t *testing.T) {
+		if csdk.apiURL != "https://api.carbone.io" {
+			t.Error(errors.New("Default URL not valid"))
+		}
+		if csdk.apiVersion != "4" {
+			t.Error(errors.New("Default URL not valid"))
+		}
+		if csdk.apiAccessToken != "" {
+			t.Error(errors.New("Api Key not empty"))
+		}
+	})
+}
+
+func TestOnPremise(t *testing.T) {
+	t.Run("Instanciate a new SDK with a custom API URL as argument", func (t *testing.T) {
+		var apiKey = "1234"
+		var apiURL = "https://test.carbone.io"
+		csdk2, err := NewCarboneSDK(apiKey, apiURL)
+		if err != nil {
+			log.Fatal(err)
+		}
+		if (csdk2.apiURL != apiURL) {
+			t.Error(errors.New("URL differents"))
+		}
+		if (csdk2.apiAccessToken != apiKey) {
+			t.Error(errors.New("API Key differents"))
+		}
+	})
+
+	t.Run("Instanciate a new SDK with a custom API URL as environment variable", func (t *testing.T) {
+		var apiKey = "4321"
+		var apiURL = "https://env.test.carbone.io"
+		os.Setenv("CARBONE_TOKEN", apiKey)
+		os.Setenv("CARBONE_URL", apiURL)
+		csdk3, err := NewCarboneSDK()
+		if err != nil {
+			log.Fatal(err)
+		}
+		if (csdk3.apiURL != apiURL) {
+			t.Error(errors.New("URL differents"))
+		}
+		if (csdk3.apiAccessToken != apiKey) {
+			t.Error(errors.New("API Key differents"))
+		}
+		os.Unsetenv("CARBONE_TOKEN")
+		os.Unsetenv("CARBONE_URL")
+	})
+}
+
 func TestGenerateTemplateID(t *testing.T) {
 	t.Run("(node test 1) generate a templateID from a file without payload", func(t *testing.T) {
 		template := "./tests/template.test.odt"