diff --git a/admin/controller/extension/payment/coingate.php b/admin/controller/extension/payment/coingate.php
index 9480653..53cdc1b 100755
--- a/admin/controller/extension/payment/coingate.php
+++ b/admin/controller/extension/payment/coingate.php
@@ -178,4 +178,9 @@ private function validate()
 
     return !$this->error;
   }
+
+  public function install() {
+    $this->load->model('extension/payment/coingate');
+    $this->model_extension_payment_coingate->install();
+  }
 }
diff --git a/admin/model/extension/payment/coingate.php b/admin/model/extension/payment/coingate.php
new file mode 100644
index 0000000..c4123f2
--- /dev/null
+++ b/admin/model/extension/payment/coingate.php
@@ -0,0 +1,18 @@
+<?php
+
+class ModelExtensionPaymentCoingate extends Model {
+  public function install() {
+    // Modify the currency table to allow 4-character currency code
+    $query = $this->db->query("
+    SELECT character_maximum_length
+    FROM information_schema.columns
+    WHERE table_name = '" . DB_PREFIX . "currency' and column_name = 'code';
+    ");
+    if ((int)$query->row['character_maximum_length'] < 4) {
+      $this->db->query("
+        ALTER TABLE `" . DB_PREFIX . "currency`
+        MODIFY `code` VARCHAR(4) COLLATE utf8_general_ci NOT NULL;
+      ");
+    }
+  }
+}
diff --git a/catalog/controller/extension/payment/coingate.php b/catalog/controller/extension/payment/coingate.php
index 42a2298..16905c5 100755
--- a/catalog/controller/extension/payment/coingate.php
+++ b/catalog/controller/extension/payment/coingate.php
@@ -50,7 +50,7 @@ public function confirm()
 
     $order = \CoinGate\Merchant\Order::createOrFail(array(
       'order_id'         => $order['order_id'],
-      'price_amount'     => number_format($order['total'] * $this->currency->getvalue($order['currency_code']), 2, '.', ''),
+      'price_amount'     => number_format($order['total'] * $this->currency->getvalue($order['currency_code']), 8, '.', ''),
       'price_currency'   => $order['currency_code'],
       'receive_currency' => $this->config->get('coingate_receive_currency'),
       'cancel_url'       => $this->url->link('extension/payment/coingate/cancel', '', $this->config->get('config_secure')),
diff --git a/install.xml b/install.xml
new file mode 100644
index 0000000..5d71920
--- /dev/null
+++ b/install.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<modification>
+	<name>CoinGate</name>
+	<code>coningate</code>
+	<version>3.1.3</version>
+	<author>Ivan</author>
+	<!-- Allow 4 characters in form validation -->
+	<file path="admin/controller/localisation/currency.php">
+		<operation>
+			<search><![CDATA[if (utf8_strlen($this->request->post['code']) != 3)]]></search>
+			<add position="replace"><![CDATA[if (!in_array(utf8_strlen($this->request->post['code']), array(3, 4)))]]></add>
+		</operation>
+	</file>
+</modification>