MPG.php

MPG.php

<?php

/**
 * Maldives Payment Gateway Integration
 * @author haris
 */

class MPG
{
    private $version;
    private $merchantId;
    private $acquirerId;
    private $signatureMethod;
    private $transactionPassword;
    private $purchaseCurrency;
    private $merchantResponseUrl = 'https://notrequiredanymore.com';

    public $orderId;
    public $purchaseAmount;
	
    // Example
    // $mpg = new MPG("ORDER-001", 9.99);
    // $mpg->getFormFields();

    public function __construct($orderId, $purchaseAmount)
    {
        // Load Defaults from Configuration File
        $this->version = '1.1';
        $this->merchantId = '9000000000';
        $this->acquirerId = '407387';
        $this->signatureMethod = 'SHA1';
        $this->transactionPassword = 'secret';
        $this->purchaseCurrency = '462';

        $this->orderId = $orderId;
        $this->purchaseAmount = $this->formatAmount($purchaseAmount);
    }

    /**
     * Format the purchase amount to 12 characters and left pad with 0
     *
     * @return string
     */
    private function formatAmount($purchaseAmount)
    {
        $formattedAmount = number_format($purchaseAmount, 2, '.', '');
        $formattedAmount = str_replace('.', '', $formattedAmount);
        return str_pad($formattedAmount, 12, '0', STR_PAD_LEFT);
    }

    /**
     * Return the data for MPG Order Form
     *
     * @return array
     */
    public function getFormFields()
    {
        return [
            'Version' => $this->version,
            'MerID' => $this->merchantId,
            'AcqID' => $this->acquirerId,
            'MerRespURL' => $this->merchantResponseUrl,
            'PurchaseCurrency' => $this->purchaseCurrency,
            'OrderID' => $this->orderId,
            'SignatureMethod' => $this->signatureMethod,
            'PurchaseAmt' => $this->purchaseAmount,
            'Signature' => $this->signature()
        ];
    }

    /**
     * Generate the signature for MPG transaction
     *
     * @retun string
     */
    public function signature()
    {
        // Concatenate the properties required for signature
        $plain_signature = $this->transactionPassword . $this->merchantId . $this->acquirerId . 
            $this->orderId . $this->purchaseAmount . $this->purchaseCurrency;

        $hash = base64_encode(sha1($plain_signature, true));


        // Hash, base64 encode and return the signature
        return $hash;
    }

    /**
     * Verify generated signature
     *
     * @return Boolean
     */
	public function verifySignature($orderId, $purchaseAmount, $signature) {
        $purchaseAmount = $this->formatAmount($purchaseAmount);

        $new_sig = $this->transactionPassword. $this->merchantId . $this->acquirerId . 
            $orderId . $purchaseAmount . $this->purchaseCurrency;

        if ($signature == base64_encode(sha1($new_sig, TRUE))) 
            return true;

        return false;
	}

    /**
     * Generate the Signature after successful transaction
     * To compare with the Signature returned by Bank
     *
     * @return String
     */
    public function generateSignatureTwo($responseCode, $reasonCode)
    {
        $signature = $this->transactionPassword . $this->merchantId . $this->acquirerId . $this->orderId .
            $responseCode . $reasonCode;

        return base64_encode(sha1($signature, true));
    }

}