Menually Created Payment Gateways - Auto redirect to action page

[zahidfact]

I have created a "TrxID Submission form"

Problem is when a user place an order then auto-redirect to Submission form action page.
That's why user need to open invoice manually.

But Should be sticky "TrxID Submission form" or Auto-redirect to invoice page.

See this video then you will understand: https://www.screencast.com/t/eMFOn47V6

Please see "TrxID Submission form" Code and help me how to sticky "TrxID Submission form" or Auto-redirect to invoice page.

 

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Spoiler

Please see my "TrxID Submission form" Code: 

<?php

function bKash_Payment_link($params) {
    global $_LANG;

    $code ='


    
<img class="test site-logo" src="https://www.bkash.com/sites/all/themes/bkash/logo.png" alt="bkash"><br>
<a target="_blank" href="https://client.iithost.com/knowledgebase/12/bKash.html">How To Pay?</a>
    
<div style="text-align: left;">
<span style="color: green;"><b><span style="color: green;">Dial </span><span style="color: red;">*247#&nbsp;</span></b></span><br />
<span style="color: green;"><b><span style="color: green;">Choose “</span><span style="color: red;">Send Money</span><span style="color: green;">”&nbsp;</span></b></span><br />
<span style="color: green;"><b><span style="color: green;">Account No: </span><span style="color: red; font-size: medium;">01726000129</span></b></span><br />
<span style="color: green;"><b><span style="color: green;">Amount:</span><span style="color: red;"> '.nl2br($params['amount']).'</span></b></span><br />
<span style="color: green;"><b><span style="color: green;">Reference: </span><span style="color: red;">'.$_LANG[''].''.$params['invoiceid'].'&nbsp;</span></b></span><br />
<span style="color: green;"><b><span style="color: green;">Enter PIN to confirm: </span><span style="color: red; font-size: medium;">bKash Pin</span></b></span><br />
<span style="color: green;"><b><br /></b></span>
<span style="color: green;"><b>Done! You will receive a confirmation message from bKash.</b></span></div><br>
<span style="color: darkmagenta;"><b>Now Submit TrxID Below ></b></span><br>






    <div class="payment-btn-container hidden-print" align="center">
    <form id="form1" name="form1" method="post" action="https://iithost.xyz/bill/modules/gateways/callback/bkash.php">
    <input type="hidden" name="name" value="Send Money">
    <input type="hidden" name="total_amount" value="'.nl2br($params['amount']).'">
    <input type="hidden" name="invoice_id" value="'.$_LANG[''].''.$params['invoiceid'].'">
    <label for="trx_id"></label>
    <input name="trx_id" type="text" id="trx_id" style="text-align:center;font-weight:bold;" size="15" placeholder="Type TrxID" minlength="10" maxlength="10" required="required"></p>
    <input type="submit" name="button" id="button" class="btn btn-primary" value="Submit TrxID">
    </form>
    </div>

    
    
    
    ';

    return $code;

}