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// Get params:

$amount=$params['Amount'];
$firstname=$params['First Name'];
$lastname=$params['Last Name'];
$address=$params['Address'];
$city=$params['City'];
$state=$params['State'];
$zip=$params['Zip'];
$ccnumber=$params['Credit Card Number'];
$expiration=$params['Expiration'];
$email=$params['Email'];
$phone=$params['Phone'];
$referencenumber=$params['Reference Number'];

$post_url = "https://secure.authorize.net/gateway/transact.dll";

$post_values = array(
    
    // the API Login ID and Transaction Key must be replaced with valid values
    "x_login"            => "xxxxxx",
    "x_tran_key"        => "xxxxxxxx",

    "x_version"            => "3.1",
    "x_delim_data"        => "TRUE",
    "x_delim_char"        => "|",
    "x_relay_response"    => "FALSE",

    "x_type"            => "AUTH_CAPTURE",
    "x_method"            => "CC",
    "x_card_num"        => "$ccnumber",
    "x_exp_date"        => "$expiration",

    "x_amount"            => "$amount",
         "x_invoice_num"        => "$referencenumber",

    "x_first_name"        => "$firstname",
    "x_last_name"        => "$lastname",
    "x_address"            => "$address",
        "x_city"            => "$city",
    "x_state"            => "$state",
    "x_zip"                => "$zip",
        "x_email"                => "$email",
        "x_phone"                => "$phone",

);

// This section takes the input fields and converts them to the proper format
// for an http post.  For example: "x_login=username&x_tran_key=a1B2c3D4"
$post_string = "";
foreach( $post_values as $key => $value )
    { $post_string .= "$key=" . urlencode( $value ) . "&"; }
$post_string = rtrim( $post_string, "& " );

$request = curl_init($post_url); // initiate curl object
    curl_setopt($request, CURLOPT_HEADER, 0); // set to 0 to eliminate header info from response
    curl_setopt($request, CURLOPT_RETURNTRANSFER, 1); // Returns response data instead of TRUE(1)
    curl_setopt($request, CURLOPT_POSTFIELDS, $post_string); // use HTTP POST to send form data
    curl_setopt($request, CURLOPT_SSL_VERIFYPEER, FALSE); // uncomment this line if you get no gateway response.
    $post_response = curl_exec($request); // execute curl post and store results in $post_response
    // additional options may be required depending upon your server configuration
    // you can find documentation on curl options at http://www.php.net/curl_setopt
curl_close ($request); // close curl object

// This line takes the response and breaks it into an array using the specified delimiting character
$response_array = explode($post_values["x_delim_char"],$post_response);

// The results are output to the screen in the form of an html numbered list.
echo "<OL>\n";
foreach ($response_array as $value)
{
    echo "<LI>" . $value . " </LI>\n";
    $i++;
}
echo "</OL>\n";