Add unlink account endpoint

Service/FacebookMessengerService.php

@@ -169,6 +169,32 @@ public function getPsid($linkingToken)
         return json_decode($this->curlService->get($url, $params), true);
     }
 
+    /**
+     * Account Unlink
+     *
+     * @param string|int $psid
+     *
+     * @return mixed
+     *
+     * @throws FacebookMessengerException
+     */
+    public function unlinkAccount($psid)
+    {
+        $this->checkAccessToken();
+
+        $params = [
+            'access_token' => $this->accessToken,
+        ];
+
+        $content = $this->serializer->serialize([
+            'psid' => $psid,
+        ], 'json');
+
+        $url = self::FB_API_URL.'/me/unlink_accounts?'.http_build_query($params);
+
+        return json_decode($this->curlService->post($url, $content), true);
+    }
+
     /**
      * Handle a verification token request, check against the given verificationToken.
      * Throw an exception when the token is invalid, or return null when the request isn't a verification request.

Tests/Service/FacebookMessengerServiceTest.php

@@ -154,6 +154,30 @@ public function testGetPsid()
         self::assertEquals(2, $result['recipient']);
     }
 
+    /**
+     * Test unlink an account
+     *
+     * @throws \PouleR\FacebookMessengerBundle\Exception\FacebookMessengerException
+     */
+    public function testUnlinkAccount()
+    {
+        $curlService = $this->createMock(CurlService::class);
+        $curlService->expects(self::once())
+            ->method('post')
+            ->with(
+                'https://graph.facebook.com/v2.6/me/unlink_accounts?access_token=token',
+                '{"psid":"PSID"}'
+            )
+            ->willReturn('{"result": "unlink account success"}');
+
+        $service = new FacebookMessengerService($curlService);
+        $service->setAccessToken('token');
+
+        $result = $service->unlinkAccount('PSID');
+
+        self::assertEquals('unlink account success', $result['result']);
+    }
+
     /**
      * Test if null is returned when there is no hub_mode set in the request
      */