php - Trouble with HTTP POS REQUEST HASH KEY -


i'm trying connect payment gateway , have form below sent http post:

<form name="submit2gtpay_form" action="" target="_self" method="post">    <input type="hidden" name="gtpay_mert_id" value="17" />    <input type="hidden" name="gtpay_tranx_id" value="" />    <input type="hidden" name="gtpay_tranx_amt" value="5000" />    <input type="hidden" name="gtpay_tranx_curr" value="566" />    <input type="hidden" name="gtpay_cust_id" value="458742" />    <input type="hidden" name="gtpay_cust_name" value="test customer" />    <input type="hidden" name="gtpay_tranx_memo" value="mobow" />    <input type="hidden" name="gtpay_no_show_gtbank" value="yes" />    <input type="hidden" name="gtpay_echo_data" value="test" />    <input type="hidden" name="gtpay_gway_name" value="" />    <input type="hidden" name="gtpay_tranx_hash" value="" />    <input type="hidden" name="gtpay_tranx_noti_url" value="" />    <input type="submit" value="pay via gtpay" name="btnsubmit"/>    <input type="hidden" name="gtpay_echo_data" value="">  </form>

i'm required perform sha512 hash of [gtpay_tranx_id + gtpay_tranx_amt +gtpay_tranx_noti_url + hashkey]

the transaction amount should in kobo , strings should concatenated hashkey before getting sha512 hash of entire string.

but value of gtpay_tranx_hash variable, how do becuase when echo it, missing value

please appreciated

<?php    //the has key requested  $key = hash('sha512','664879809+500000+myurl+thekeytheysupply');   //create array of data posted   $post_data['gtpay_mert_id'] = 3649;   $post_data['gtpay_tranx_id'] = 664879809;   $post_data['gtpay_tranx_amt'] = 500000;   $post_data['gtpay_tranx_curr'] =  566;   $post_data['gtpay_cust_id'] = 458742;   $post_data['gtpay_cust_name'] = 'test customer';   $post_data['gtpay_tranx_memo'] = 'mobow';   $post_data['gtpay_no_show_gtbank'] = 'yes';   $post_data['gtpay_echo_data'] ='test';   $post_data['gtpay_tranx_hash'] = $key;    $post_data['gtpay_tranx_noti_url'] =  'mynotificationurl';  //traverse array , prepare data posting (key1=value1)  foreach ( $post_data $key => $value) {     $post_items[] = $key . '=' . $value;      }     //create final string posted using implode()    $post_string = implode ('&', $post_items);    //usrl    $url = 'thebankurl';      $ch = curl_init(); //initialize curl handle      // enable below 2 linesfor https sites     curl_setopt($ch, curlopt_ssl_verifyhost, 0);      curl_setopt($ch, curlopt_ssl_verifypeer, 0);      curl_setopt($ch, curlopt_url, $url); //set url      //curl_setopt($ch, curlopt_httpheader, $header);      curl_setopt($ch, curlopt_returntransfer,1); //return variable      //curl_setopt($ch, curlopt_header, 0);      curl_setopt($ch, curlopt_post, 1); //set post method     curl_setopt($ch, curlopt_postfields, $post_string); //set post variables      curl_setopt($ch, curlopt_http_version, curl_http_version_1_1);      $response = curl_exec($ch); //run whole process , return response      curl_close($ch); //close curl handle


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