Quickie paypal implementation (untested)

gistfile1.txt

function chargeCreditCard($detail) {
	$API_USERNAME = '-USERNAME-';
	$API_PASSWORD = '-PASSWORD';
	$API_CERTIFICATE = '-SSL-CERT-';
	$API_SIGNATURE = '';
	$API_ENDPOINT = 'https://api.paypal.com/nvp';
	$PAYPAL_URL = 'https://www.paypal.com/webscr&cmd=_express-checkout&token=';
	$VERSION = '51.0';

	$return = array(
		'error'=>false,
		'message'=>'',
		'transaction_id'=>false
	);

	if (
		!isset($detail['CREDITCARDTYPE']) || 
		!isset($detail['ACCT']) || 
		!isset($detail['EXPDATE']) || 
		!isset($detail['CVV2']) || 
		!isset($detail['CURRENCYCODE']) || 
		!isset($detail['COUNTRYCODE']) || 
		!isset($detail['PAYMENTACTION']) || 
		!isset($detail['DESC']) || 
		!isset($detail['AMT'])
	){
		$return['error'] = true;
		$return['message'] = 'Missing required values';
	}

	$post_string='
		METHOD=doDirectPayment&
		VERSION='.urlencode($VERSION).'&
		PWD='.urlencode($API_PASSWORD).'&
		USER='.urlencode($API_USERNAME)
	;
	foreach($detail as $k=>$v)
		$post_string.= "&".$k."=".urlencode($v);

	$ch = curl_init();
	curl_setopt($ch, CURLOPT_SSLCERT, $API_CERTIFICATE);
	curl_setopt($ch, CURLOPT_URL,$API_ENDPOINT);
	curl_setopt($ch, CURLOPT_VERBOSE, 1);
	curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
	curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
	curl_setopt($ch, CURLOPT_POST, 1);

	curl_setopt($ch,CURLOPT_POSTFIELDS,$nvpreq);

	$response = curl_exec($ch);

	$response = deformatNVP($response);

	$ack = strtoupper($response["ACK"]);
 
	if($ack=="FAILURE") {
		$out = '';
		if (isset($response['L_LONGMESSAGE0']))
			$out = $response['L_LONGMESSAGE0'];
		if (isset($response['L_LONGMESSAGE0']))
			$out .= '('.$response['L_ERRORCODE0'].')';
		$return['error'] = true;
		$return['message'] = $out;
		return $return;
	}
	$return['transaction_id'] = $response['TRANSACTIONID'];
	return $return;
}
function deformatNVP($nvpstr) {
	$intial=0;
 	$nvpArray = array();	
	while(strlen($nvpstr)){
		$keypos= strpos($nvpstr,'=');
		$valuepos = strpos($nvpstr,'&') ? strpos($nvpstr,'&'): strlen($nvpstr);
		$keyval=substr($nvpstr,$intial,$keypos);
		$valval=substr($nvpstr,$keypos+1,$valuepos-$keypos-1);
		$nvpArray[urldecode($keyval)] =urldecode( $valval);
		$nvpstr=substr($nvpstr,$valuepos+1,strlen($nvpstr));
     }
	return $nvpArray;
}