diff --git a/src/Paranoia/Configuration/Est.php b/src/Paranoia/Configuration/Est.php
index ae19f74..40a88c0 100644
--- a/src/Paranoia/Configuration/Est.php
+++ b/src/Paranoia/Configuration/Est.php
@@ -31,6 +31,7 @@ class Est extends AbstractConfiguration
     public function setClientId($clientId)
     {
         $this->clientId = $clientId;
+        return $this;
     }
 
     /**
@@ -47,6 +48,7 @@ public function getClientId()
     public function setMode($mode)
     {
         $this->mode = $mode;
+        return $this;
     }
 
     /**
@@ -63,6 +65,7 @@ public function getMode()
     public function setPassword($password)
     {
         $this->password = $password;
+        return $this;
     }
 
     /**
@@ -79,6 +82,7 @@ public function getPassword()
     public function setUsername($username)
     {
         $this->username = $username;
+        return $this;
     }
 
     /**
diff --git a/src/Paranoia/Configuration/Gvp.php b/src/Paranoia/Configuration/Gvp.php
index f43a260..50f1470 100644
--- a/src/Paranoia/Configuration/Gvp.php
+++ b/src/Paranoia/Configuration/Gvp.php
@@ -47,6 +47,7 @@ class Gvp extends AbstractConfiguration
     public function setAuthorizationPassword($authorizationPassword)
     {
         $this->authorizationPassword = $authorizationPassword;
+        return $this;
     }
 
     /**
@@ -63,6 +64,7 @@ public function getAuthorizationPassword()
     public function setAuthorizationUsername($authorizationUsername)
     {
         $this->authorizationUsername = $authorizationUsername;
+        return $this;
     }
 
     /**
@@ -79,6 +81,7 @@ public function getAuthorizationUsername()
     public function setMerchantId($merchantId)
     {
         $this->merchantId = $merchantId;
+        return $this;
     }
 
     /**
@@ -95,6 +98,7 @@ public function getMerchantId()
     public function setMode($mode)
     {
         $this->mode = $mode;
+        return $this;
     }
 
     /**
@@ -111,6 +115,7 @@ public function getMode()
     public function setRefundPassword($refundPassword)
     {
         $this->refundPassword = $refundPassword;
+        return $this;
     }
 
     /**
@@ -127,6 +132,7 @@ public function getRefundPassword()
     public function setRefundUsername($refundUsername)
     {
         $this->refundUsername = $refundUsername;
+        return $this;
     }
 
     /**
@@ -143,6 +149,7 @@ public function getRefundUsername()
     public function setTerminalId($terminalId)
     {
         $this->terminalId = $terminalId;
+        return $this;
     }
 
     /**
diff --git a/src/Paranoia/Configuration/Posnet.php b/src/Paranoia/Configuration/Posnet.php
index ec6e6cb..f0baac5 100644
--- a/src/Paranoia/Configuration/Posnet.php
+++ b/src/Paranoia/Configuration/Posnet.php
@@ -32,6 +32,7 @@ class Posnet extends AbstractConfiguration
     public function setClientId($clientId)
     {
         $this->clientId = $clientId;
+        return $this;
     }
 
     /**
@@ -48,6 +49,7 @@ public function getClientId()
     public function setPassword($password)
     {
         $this->password = $password;
+        return $this;
     }
 
     /**
@@ -64,6 +66,7 @@ public function getPassword()
     public function setTerminalId($terminalId)
     {
         $this->terminalId = $terminalId;
+        return $this;
     }
 
     /**
@@ -80,6 +83,7 @@ public function getTerminalId()
     public function setUsername($username)
     {
         $this->username = $username;
+        return $this;
     }
 
     /**