diff --git a/src/Merchant.php b/src/Merchant.php
new file mode 100644
index 0000000..92e707b
--- /dev/null
+++ b/src/Merchant.php
@@ -0,0 +1,130 @@
+<?php
+
+/*
+ * InterKassa plugin for PHP merchant library
+ *
+ * @link      https://github.com/hiqdev/php-merchant-interkassa
+ * @package   php-merchant-interkassa
+ * @license   BSD-3-Clause
+ * @copyright Copyright (c) 2015, HiQDev (https://hiqdev.com/)
+ */
+
+namespace hiqdev\php\merchant\interkassa;
+
+class Merchant extends \hiqdev\php\merchant\Merchant
+{
+    protected static $_defaults = [
+        'name'        => 'interkassa',
+        'label'       => 'InterKassa',
+        'actionUrl'   => 'https://sci.interkassa.com/',
+        'confirmText' => 'OK',
+    ];
+
+    public function isNewVersion()
+    {
+        return !strpos($this->purse, '-');
+    }
+
+    public function getPaymentNo()
+    {
+        return $this->username . '_' . $this->cents . '_' . $this->uniqId;
+    }
+
+    public function getPaymentId()
+    {
+        return (strpos($this->username,'@') === false ? $this->username : substr($this->username, 0, strpos($this->username)+1)) .'_'. $this->uniqId,
+    }
+
+    public function getBaggageFields()
+    {
+        return $this->currency . ' ' . $this->username;
+    }
+
+    public function getInputs()
+    {
+        return $this->isNewVersion() ? [
+            'ik_co_id'          => strtolower($this->purse),
+            'ik_am'             => $this->total,
+            'ik_pm_no'          => $this->paymentNo,
+            'ik_desc'           => $this->description,
+            'ik_cur'            => $this->currency,
+            'ik_pnd_u'          => $this->confirmUrl,
+            'ik_suc_u'          => $this->successUrl,
+            'ik_fal_u'          => $this->failureUrl,
+            'ik_pnd_m'          => 'POST',
+            'ik_suc_m'          => 'POST',
+            'ik_fal_m'          => 'POST',
+        ] : [
+            'ik_shop_id'        => $this->purse,
+            'ik_payment_amount' => $this->total,
+            'ik_payment_id'     => $this->paymentId,
+            'ik_payment_desc'   => $this->description,
+            'ik_baggage_fields' => $this->baggageFields,
+            'ik_status_url'     => $this->confirmUrl,
+            'ik_success_url'    => $this->successUrl,
+            'ik_fail_url'       => $this->failureUrl,
+            'ik_success_method' => 'POST',
+            'ik_fail_method'    => 'POST',
+            'ik_status_method'  => 'POST',
+        ];
+    }
+
+    public function validateConfirmation($data)
+    {
+        return $this->isNewVersion()
+            ? $this->validateNewVersion($data)
+            : $this->validateOldVersion($data)
+        ;
+    }
+
+    public function validateNewVersion($data)
+    {
+        $iks = $data;
+        if ($data['ik_co_id'] != $this->purse) {
+            return 'Wrong purse';
+        }
+        if ($data['ik_inv_st'] != 'success') {
+            return 'Wrong state';
+        }
+        unset($iks['ik_sign']);
+        foreach ($iks as $k=>$v) if (substr($k,0,3)!='ik_') unset($iks[$k]);
+        array_push($iks, $this->secret);
+        ksort($iks, SORT_STRING);
+        $hash =  base64_encode(md5(implode(':',$iks), true));
+        if ($hash != strtolower($data['ik_sign'])) {
+            return 'Wrong hash';
+        }
+        $this->mset([
+            'from'  => $data['ik_pm_no'],
+            'txn'   => $data['ik_trn_id '],
+            'sum'   => $data['ik_am'],
+            'time'  => $this->formatDatetime($data['ik_inv_prc']),
+        ]);
+        return null;
+    }
+
+    public function validateOldVersion($data)
+    {
+        $iks = $data;
+        if ($data['ik_shop_id'] != $this->purse) {
+            return 'Wrong purse';
+        }
+        if ($data['ik_payment_state'] != 'success') {
+            return 'Wrong state';
+        }
+        unset($iks['ik_sign_hash'], $iks['ik_payment_desc'], $iks['ik_payment_timestamp']);
+        foreach ($iks as $k=>$v) if (substr($k,0,3)!='ik_') unset($iks[$k]);
+        array_push($iks, $this->secret);
+        $hash = md5(implode(':', $iks));
+        if ($hash != strtolower($data['ik_sign_hash'])) {
+            return 'Wrong hash';
+        }
+        $this->mset(array(
+            'from'  => $data['ik_payment_id'],
+            'txn'   => $data['ik_trans_id'],
+            'sum'   => $data['ik_payment_amount'],
+            'time'  => $this->formatDatetime($data['ik_payment_timestamp']),
+        ));
+        return null;
+    }
+}
diff --git a/src/assets/logo.png b/src/assets/logo.png
new file mode 100644
index 0000000..a4e13c9
Binary files /dev/null and b/src/assets/logo.png differ
diff --git a/src/assets/style.css b/src/assets/style.css
new file mode 100644
index 0000000..6a17950
--- /dev/null
+++ b/src/assets/style.css
@@ -0,0 +1,3 @@
+.merchant-interkassa-bg {
+    background: url(logo.png) no-repeat right;
+}