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<?php
use li3_behaviors\data\model\Behavior;

class BtcPayment extends Behavior
{
    protected static $_defaults = ['fields' => ['btc_received_value', 'btc_required_value']];

    public function completePayment($model, $behavior, $entity, $secret)
    {
        if (!isset($entity->btc_recieved_value, $entity->btc_transaction_hash)) {
            return 'value and hash not set';
        }

        if ($this->_verifyAmount($entity) && $this->_verifySecret($entity, $secret)) {
            return $entity->completeDonation();
        } else {
            return 'amount or secret not verified';
        }
    }
}

//--- implementation code:

use app\models\Donation;

Donation::bindBehavior('BtcPayment');

$secret = htmlspecialchars($_GET['secret']);
$donation_id = htmlspecialchars($_GET['donation_id']);
$transaction_hash = htmlspecialchars($_GET['transaction_hash']);
$destination_address = htmlspecialchars($_GET['address']);
$value_in_satoshi = htmlspecialchars($_GET['value']);

$donation = Donation::find($donation_id);

$donation->btc_transaction_hash = $transaction_hash;
$donation->btc_received_value = $value_in_satoshi;
$donation->save();

$response = $donation->completePayment($secret);

echo $response;

class Donation extends Model
{
    use Behaviors;

    protected $_actsAs = [
        'StripeDonation' => ['devMode' => false],
        'BtcDonation' => ['fields' => ['btc_received_value', 'btc_required_value']]
    ];

}

class StripeDonation extends Behavior
{
    protected static $_defaults = ['devMode' => false];

    public function completePayment($model, $behavior, $entity, $token, $email) {}
}

class BtcDonation extends Behavior
{
   protected static $_defaults = ['fields' => ['btc_received_value', 'btc_required_value']];

   public function completePayment($model, $behavior, $entity, $secret) {}
}

#Implementation

use app\models\Donation;

Donation::bindBehavior('BtcDonation');

$donation = Donation::find(3);
$donation->completePayment('thesecret');

#Error received: Missing argument 5 for  
#app\extensions\data\behavior\StripeDonation::completePayment(), called in
# /data/base/libraries/lithium/core/Object.php on line 146 and defined