Get curl installed on your system - look it up at google - or see from phpinfo() if it's not already on your system - you can submit information unlimited times no problem, ftp it, pretty much anything. Here is an example using curl:
$formdata = array ( "REQUESTTYPE" => "APPROVALONLY","MERCHANTID" => "worldimpact",
"AMOUNT" => "$AMOUNT","CUSTOMERID" => "$NameID",
"BNAME" => "$BNAME", "BCOMPANY" => "$BCOMPANY","BADDRESS1" => "$BADDRESS1","BCITY" => "$BCITY",
"BSTATE" => "$BSTATE","BZIPCODE" => "$BZIPCODE","BCOUNTRY" => "$BCOUNTRY",
"CCNUMBER" => "$CCNUMBER","CCTYPE" => "$CCTYPE","EXPMO" => "$EXPMO",
"EXPYE" => "$EXPYR","BEMAIL" => "$BEMAIL");
foreach($formdata AS $key => $val){
$urlstring .= urlencode($key) . "=" . urlencode($val) . "&";
}
$urlstring = substr($urlstring, 0, -1);
//print($urlstring);
$ch = curl_init("https://secure1.merchantmanager.com/ccgateway.asp");
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $urlstring);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 0);
curl_setopt($ch, CURLOPT_REFERER, "https://secured.com/~f1506/golf/checkout.php");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$data = curl_exec($ch);
curl_close($ch);
//note $data is the return string from the remote page in response