Help with adding captcha to payment form

Chrisjc — Thu, 21 May 2026 18:19:16 GMT

Hello,

I have an older payment form on a client's website that we inherited. The form collects the basic customer data along with the amount they are going to pay. The form action is a post to 'authorize_sim_send.php'. This seems to be a legacy method, but it has been working fine for the client. We want to add a Captcha to the website form, but I can't seem to get it to work. I can insert the captcha and script and it will display just fine, but I'm at a loss as to the correct code to add to the above referenced file to get it to work. I've added the code below. I appreciate any guidance anyone can provide.

<?php require_once('config.inc.php'); require_once('functions.inc.php'); if ( count($_POST) < 1 ) die(';)'); foreach ( $_POST as $k => $v ){ if ( is_array( $v ) ){ foreach ( $v as $k1 => $v1 ){ $$k[$k1] = $v1; } } else{ $$k = $v; } } // Receive the posted amount and format it as a dollar amount without the currency symbol $amount = number_format(trim($chargetotal,"$"),2); // Generate a random sequence number $sequence = rand(1, 1000); // Generate a timestamp $timestamp = time(); // Generate an invoice $invoice = date('YmdHis'); if ( @!session_start() ){ $mytimeout = 720 * 60; // minutes * 60 @session_set_cookie_params($mytimeout); $sessdir = "/tmp"; @ini_set('session.save_path', $sessdir); @session_cache_expire($mytimeout / 60); @ini_set('session.gc_maxlifetime', $mytimeout); } // Getting Customer ID $customer = @session_id(); // CURL timeout $timeout = 30; // The following lines generate the SIM fingerprint. PHP versions 5.1.2 and // newer have the necessary hmac function built in. For older versions, it // will try to use the mhash library. if( phpversion() >= '5.1.2' ) $fingerprint = hash_hmac("md5", x_login . "^" . $sequence . "^" . $timestamp . "^" . $amount . "^", x_transaction_key); else $fingerprint = bin2hex(mhash(MHASH_MD5, x_login . "^" . $sequence . "^" . $timestamp . "^" . $amount . "^", x_transaction_key)); $parms = array(); //$parms['x_ship_to_first_name'] = $parms['x_first_name'] = ( isset( $fname ) && strlen( trim( $fname ) ) > 0 )? Slug ($fname ) : ''; //$parms['x_ship_to_last_name'] = $parms['x_last_name'] = ( isset( $fname ) && strlen( trim( $fname ) ) > 0 )? Slug ($lname ) : ''; $address = ""; if ( isset( $address1 ) && strlen( $address1 ) > 0 ){ if ( strlen( trim( $address ) ) > 0 ) $address .= ", "; $address .= $address1; } if ( isset( $address2 ) && strlen( $address2 ) > 0 ){ if ( strlen( trim( $address ) ) > 0 ) $address .= ", "; $address .= $address2; } //$parms['x_ship_to_address'] = $parms['x_address'] = $address; //$parms['x_ship_to_city'] = $parms['x_city'] = ( isset( $city ) )? substr( Slug( $city ), 0, 40 ) : ''; //$parms['x_ship_to_state'] = $parms['x_state'] = ( isset( $state ) )? substr( Slug( $state ), 0, 40 ) : ''; //$parms['x_ship_to_country'] = $parms['x_country'] = 'US'; $phone = ""; if ( isset( $phone1 ) && strlen( $phone1 ) > 0 ){ $phone .= $phone1; } if ( isset( $phone2 ) && strlen( $phone2 ) > 0 ){ $phone .= $phone2; } if ( isset( $phone3 ) && strlen( $phone3 ) > 0 ){ $phone .= $phone3; } $parms['x_phone'] = Slug( $phone ); $parms['x_email'] = ( isset( $email ) )? $email : ''; //$parms['x_ship_to_zip'] = $parms['x_zip'] = ( isset( $zip ) )? $zip : ''; $parms['x_fax'] = ( isset( $fax ) )? $fax : ''; $parms['x_company'] = ( isset( $company ) )? $company : ''; $description = ""; if ( isset( $acnumber ) && strlen( $acnumber ) > 0 ){ if ( strlen( trim( $description ) ) > 0 ) $description .= ", "; $description .= "Account Number: ".$acnumber; } $mobile = ""; if ( isset( $mobile1 ) && strlen( $mobile1 ) > 0 ){ $mobile .= $mobile1; } if ( isset( $mobile2 ) && strlen( $mobile2 ) > 0 ){ $mobile .= $mobile2; } if ( isset( $mobile3 ) && strlen( $mobile3 ) > 0 ){ $mobile .= $mobile3; } if ( strlen( $mobile ) > 0 ){ if ( strlen( trim( $description ) ) > 0 ) $description .= ", "; $description .= "Cell Phone: ".$mobile; } if ( isset( $idate ) && strlen( $idate ) > 0 ){ if ( strlen( trim( $description ) ) > 0 ) $description .= ", "; $description .= "Invoice Date: ".$idate; } if ( isset( $iamount ) && strlen( $iamount ) > 0 ){ if ( strlen( trim( $description ) ) > 0 ) $description .= ", "; $description .= "Invoice Amount: $".number_format(trim($iamount,"$"),2); } if ( strlen( trim( $description ) ) < 1 ) $description = "No description"; $parms['x_description'] = $description; $parms['x_version'] = x_version; $parms['x_login'] = x_login; $parms['x_amount'] = $amount; $parms['x_type'] = x_type; $parms['x_method'] = x_method; $parms['x_duplicate_window'] = x_duplicate_window; $parms['x_cust_id'] = $customer; $parms['x_test_request'] = ( stristr( gateway_mode, 'TEST' ) )? 'TRUE' : 'FALSE'; $parms['x_fp_sequence'] = $sequence; $parms['x_fp_hash'] = $fingerprint; $parms['x_fp_timestamp'] = $timestamp; $parms['x_show_form'] = x_show_form; $parms['x_invoice_num'] = $invoice; $parms['x_relay_response'] = x_relay_response; $parms['x_header_html_payment_form'] = ( @file_exists( x_header_html_payment_form ) )? file_get_contents( x_header_html_payment_form ) : ''; $parms['x_footer_html_payment_form'] = ( @file_exists( x_footer_html_payment_form ) )? file_get_contents( x_footer_html_payment_form ) : ''; $parms['x_receipt_link_method'] = x_receipt_link_method; $parms['x_receipt_link_text'] = x_receipt_link_text; $parms['x_receipt_link_url'] = x_receipt_link_url; $parms['x_header_html_receipt'] = ( @file_exists( x_header_html_receipt ) )? file_get_contents( x_header_html_receipt ) : ''; $parms['x_footer_html_receipt'] = ( @file_exists( x_footer_html_receipt ) )? file_get_contents( x_footer_html_receipt ) : ''; $parms['x_email_customer'] = x_email_customer; $parms['x_header_email_receipt'] = ( @file_exists( x_header_email_receipt ) )? file_get_contents( x_header_email_receipt ) : ''; $parms['x_footer_email_receipt'] = ( @file_exists( x_footer_email_receipt ) )? file_get_contents( x_footer_email_receipt ) : ''; $parms['x_logo_url'] = x_logo_url; $parms['x_color_link'] = x_color_link; $parms['x_color_text'] = x_color_text; $parms['x_customer_ip'] = $HTTP_SERVER_VARS["REMOTE_ADDR"]; $url = ( stristr( gateway_environment, 'TEST' ) )? "https://test.authorize.net/gateway/transact.dll" : "https://secure.authorize.net/gateway/transact.dll"; ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <title>abc.com - Payments</title> <meta name="keywords" content="" /> <meta name="description" content="" /> <meta name="robots" content="index" /> <meta name="robots" content="follow" /> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> </head> <body onload="document.forms[0].submit();"> <FORM NAME="f" METHOD=POST ACTION="<?=$url?>"> <?php foreach ( $parms as $k => $v ){ echo "<INPUT TYPE=HIDDEN NAME=\"$k\" VALUE=\"$v\">"; } ?> </FORM> </body> </html>

topic Help with adding captcha to payment form in Integration and Testing

Help with adding captcha to payment form