diff --git a/README.md b/README.md
index 4e28bb7..d676b0f 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@
 [Omnipay](https://github.com/thephpleague/omnipay) is a framework agnostic,
 multi-gateway payment processing library for PHP.
 This package implements Sage Pay support for Omnipay.
-This version only supports PHP 7.1+.
+This version supports PHP ^5.6 and PHP ^7.
 
 This is the `master` branch of Omnipay, handling Omnipay version `3.x`.
 For the `2.x` branch, please visit https://github.com/thephpleague/omnipay-sagepay/tree/2.x
@@ -629,10 +629,10 @@ $gateway = OmniPay::create('SagePay\Form')->initialize([
 
 The `encryptionKey` is generated in "My Sage Pay" when logged in as the administrator.
 
-Note that this gateway will assume all input data (names, addresses etc.)
+Note that this gateway driver will assume all input data (names, addresses etc.)
 are UTF-8 encoded.
 It will then recode the data to ISO8859-1 before encrypting it for the gateway,
-as the gateway strictly accepts ISO8859-1 only, regardless of what encoding is
+since the gateway strictly accepts ISO8859-1 only, regardless of what encoding is
 used to submit the form from the merchant site.
 If you do not want this conversion to happen, it can be disabled with this parameter:
 
diff --git a/composer.json b/composer.json
index df3cf5b..1f95e3d 100644
--- a/composer.json
+++ b/composer.json
@@ -30,6 +30,7 @@
         }
     },
     "require": {
+        "php": "^5.6|^7",
         "omnipay/common": "~3.0"
     },
     "require-dev": {
diff --git a/tests/Message/ResponseTest.php b/tests/Message/ResponseTest.php
index 88c4298..c993f8b 100644
--- a/tests/Message/ResponseTest.php
+++ b/tests/Message/ResponseTest.php
@@ -2,6 +2,7 @@
 
 namespace Omnipay\SagePay\Message;
 
+use Omnipay\Common\Message\RequestInterface;
 use Omnipay\Tests\TestCase;
 
 class ResponseTest extends TestCase
@@ -100,4 +101,25 @@ public function testDirectPurchaseWithToken()
         $this->assertTrue($response->isSuccessful());
         $this->assertSame('{ABCDEFGH-ABCD-ABCD-ABCD-ABCDEFGHIJKL}', $response->getToken());
     }
+
+
+    public function testRedirectMethodIsPost()
+    {
+        $httpResponse = new Response($this->prophesize(RequestInterface::class)->reveal(), []);
+        $this->assertEquals('POST', $httpResponse->getRedirectMethod());
+    }
+
+    public function testDataGetters()
+    {
+        $vPSTxId = (string) rand(0, 100);
+        $securityKey = (string) rand(0, 100);
+        $data = [
+            'VPSTxId' => $vPSTxId,
+            'SecurityKey' => $securityKey,
+        ];
+        $httpResponse = new Response($this->prophesize(RequestInterface::class)->reveal(), $data);
+
+        $this->assertEquals($vPSTxId, $httpResponse->getVPSTxId());
+        $this->assertEquals($securityKey, $httpResponse->getSecurityKey());
+    }
 }