diff --git a/README.md b/README.md
index 41c915f..a51a530 100644
--- a/README.md
+++ b/README.md
@@ -24,8 +24,8 @@ Sign in to your [Dashboard](https://business.satispay.com) at [business.satispay
 Use the activation token with the `authenticateWithToken` function to generate and exchange a pair of RSA keys.
 
 Save the keys in your database or in a **safe place** not accesibile from your website.
-
 ```php
+// Initialize an empty Api
 $api = new \SatispayOnline\Api();
 
 // Authenticate and generate the keys
@@ -39,11 +39,8 @@ $serverPublicKey = $api->getServerPublicKey();
 ```
 
 To reuse the keys after authentication, pass them as an argument in the `\SatispayOnline\Api` constructor.
-
 ```php
-$api = new \SatispayOnline\Api();
-
-// Keys
+// Keys variables
 $publicKey = "-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhk...";
 $privateKey = "-----BEGIN PRIVATE KEY-----\nMIIEvQIBADANBg...";
 $keyId = "ldg9sbq283og7ua1abpj989kbbm2g60us6f18c1sciq...";
@@ -65,3 +62,18 @@ try {
   exit;
 }
 ```
+
+## Enable Sandbox
+To enable sandbox pass `isSandbox` with value `true` as an argument in the `\SatispayOnline\Api` constructor.
+```php
+// Pass isSandbox = true to Api constructor
+$api = new \SatispayOnline\Api([
+  "isSandbox" => true
+  // Other arguments
+]);
+```
+
+You can also use the `setIsSandbox` function.
+```php
+$api->setIsSandbox(true);
+```
diff --git a/lib/Api.php b/lib/Api.php
index d410a30..a78465b 100644
--- a/lib/Api.php
+++ b/lib/Api.php
@@ -41,6 +41,10 @@ public function __construct($options = []) {
       $this->keyId = $options["keyId"];
     }
 
+    if (!empty($options["isSandbox"]) && $options["isSandbox"] === true) {
+      $this->env = "staging";
+    }
+
     $this->amounts = new Amounts($this);
     $this->charges = new Charges($this);
     $this->checkouts = new Checkouts($this);
@@ -140,4 +144,28 @@ public function getKeyId() {
   public function getVersion() {
     return $this->version;
   }
+
+  /**
+   * Is sandbox enabled?
+   * @return boolean
+  */
+  public function getIsSandbox() {
+    if ($this->env === "staging") {
+      return true;
+    } else {
+      return false;
+    }
+  }
+
+  /**
+   * Enable or disable sandbox
+   * @param boolean $value
+  */
+  public function setIsSandbox($value) {
+    if ($value === true) {
+      $this->env = "staging";
+    } else {
+      $this->env = "production";
+    }
+  }
 }