Error in the install file of the module..

Hi,
The following schema definition in my module.install file runs into error
$schema['payment_mode'] = array(
'description' => 'This table stores various payment types for a particular user, based on uid',
'fields' =>
array (
'id' =>
array (
'type' => 'serial',
'size' => 'small',
'not null' => true,
'unsigned' => true,
'autoincrement' => true,
'description' => 'id for each row value.',
),
'uid' =>
array (
'type' => 'int',
'length' => 10,
'not null' => true,
'unsigned' => true,
'description' => 'The {users}.uid that owns this payment mode',
),
'Type' =>
array (
'type' => 'varchar',
'length' => 32,
'default' => '',
'description' => 'Card Type, either of visa, mastercard',
),
'Card_Name' =>
array (
'type' => 'varchar',
'length' => 80,
'not null' => false,
'description' => 'Card Holders name',
),
'Card_Number' =>
array (
'type' => 'int',
'length' => 16,
'not null' => false,
'description' => 'Card Number',
),
'Expiry_Month' =>
array (
'type' => 'int',
'length' => 2,
'not null' => false,
'description' => 'Expiry Month',
),
'Expiry_Year' =>
array (
'type' => 'int',
'length' => 2,
'not null' => false,
'description' => 'Expiry Year',
),
'CVV' =>
array (
'type' => 'int',
'length' => 3,
'not null' => false,
'description' => 'CVV',
),
'Email' =>
array (
'type' => 'varchar',
'length' => 50,
'not null' => false,
'description' => 'Email Address for paypal',
),
'Status' =>
array (
'type' => 'varchar',
'length' => 10,
'not null' => false,
'default' => 'ACTIVE',
'description' => 'Status for the payment mode',
),
'Category' =>
array (
'type' => 'varchar',
'length' => 20,
'not null' => false,
'description' => 'Category of the Card, for now all CC are marked VISA',
),
'primary key' =>
array ('id' ),
'unique key' =>
array ('uid' ),
),

-------------
The error reported is

# user warning: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'DEFAULT NULL, `unique key` DEFAULT NULL ) /*!40100 DEFAULT CHARACTER SET UTF8 ' at line 13 query: CREATE TABLE payment_mode ( `id` SMALLINT unsigned NOT NULL auto_increment, `uid` INT(10) unsigned NOT NULL, `Type` VARCHAR(32) DEFAULT '', `Card_Name` VARCHAR(80) DEFAULT NULL, `Card_Number` INT(16) DEFAULT NULL, `Expiry_Month` INT(2) DEFAULT NULL, `Expiry_Year` INT(2) DEFAULT NULL, `CVV` INT(3) DEFAULT NULL, `Email` VARCHAR(50) DEFAULT NULL, `Status` VARCHAR(10) DEFAULT 'ACTIVE', `Category` VARCHAR(20) DEFAULT NULL, `primary key` DEFAULT NULL, `unique key` DEFAULT NULL ) /*!40100 DEFAULT CHARACTER SET UTF8 */ in /var/www/iguru/includes/database.inc on line 515.

Kindly suggest what needs to be changed in my install file.. The SQLfor the same which i want is --

CREATE TABLE IF NOT EXISTS `payment_mode` (
`id` int(11) NOT NULL auto_increment,
`uid` int(10) NOT NULL,
`Type` varchar(32) default NULL,
`Card_Name` varchar(80) default NULL,
`Card_Number` bigint(16) default NULL,
`Expiry_Month` int(2) default NULL,
`Expiry_Year` int(2) default NULL,
`CVV` int(3) default NULL,
`Email` varchar(50) default NULL,
`Status` varchar(10) NOT NULL default 'ACTIVE',
`Category` varchar(20) NOT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `uid` (`uid`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 ;
----

Thanks in Advance
-Srbhaska