翻資料的時候發現 Sift Science 這家公司，直接看官網提供的範例程式碼會比較清楚，PHP code 長這樣：(在 single quote 裡面放變數，看起來不會動 XDDD)
require 'sift-php/lib/Services_JSON-1.0.3/JSON.php';
require 'sift-php/lib/SiftRequest.php';
require 'sift-php/lib/SiftResponse.php';
require 'sift-php/lib/SiftClient.php';
$sift = new SiftClient('my_api_key');
$response = $sift->track('$transaction', array(
'$user_id' => '$billy_jones_301',
'$user_email' => '$bill@gmail.com',
'$transaction_type' => '$sale',
'$transaction_status' => '$success',
'$amount' => '100000000',
'$currency_code' => 'USD',
'$billing_address' => array(
'$name' => 'Bill Jones',
'$phone' => '1-415-555-6041',
'$address_1' => '2100 Main Street',
'$address_2' => 'Apt 3B',
'$city' => 'New London',
'$region' => 'New Hampshire',
'$country' => 'US',
'$zipcode' => '03257'
),
'$payment_method' => array(
'$payment_type' => '$credit_card',
'$payment_gateway' => '$braintree',
'$card_bin' => '542486',
'$card_last4' => '4444'
)
));
查 https://packagist.org/search/?q=Sift 這邊也有看到一些東西，應該也可以用 Composer 掛起來用...
費用的部份，量夠大的時候，平均下來就是一筆 USD$0.01 (前一萬筆不用錢，接下來一萬筆 USD$0.02，然後都是 USD$0.01)，約 NTD$0.3：
First 10,000 transactions per month Free!
Next 10,000 transactions 2¢ each
Every transaction above that 1¢ each