Basic authentication in payment

Basic authentication in payment

Good afternoon!
A question about payment.
After forming the url step 6, the bank sends a get request. Back from the bank returns to get an answer to basic authentication.
The function checkTransaction prescribed entering login and password basic authentication:
function checkTransaction {
$ Basic_login = $ pmconfigs [ 'basic_login'];
$ Basic_pass = $ pmconfigs [ 'basic_password'];
if (isset ($ _ SERVER [ 'REDIRECT_HTTP_AUTHORIZATION'])) {
$ _SERVER [ 'HTTP_AUTHORIZATION'] = $ _SERVER [ 'REDIRECT_HTTP_AUTHORIZATION'];
}

if (preg_match ( '/ Basic \ s + (. *) $ / i', $ _SERVER [ 'HTTP_AUTHORIZATION'], $ matches))
        {
            list ($ name, $ password) = explode ( ':', base64_decode ($ matches [1]));
            $ _SERVER [ 'PHP_AUTH_USER'] = strip_tags ($ name);
$ _SERVER [ 'PHP_AUTH_PW'] = strip_tags ($ password);
}
        
      else if (! isset ($ _ SERVER [ 'PHP_AUTH_USER'])) {
            header ( 'WWW-Authenticate: Basic realm = "elitinstrument"');
            header ( 'HTTP / 1.0 401 Unauthorized');
            echo 'Cancel';
            exit;
        } else
            if ($ _ SERVER [ 'PHP_AUTH_USER']! = $ basic_login && $ _SERVER [ 'PHP_AUTH_PW']! = $ basic_pass)
{
                header ( 'WWW-Authenticate: Basic realm = "Authorize"');
                header ( 'HTTP / 1.0 401 Unauthorized');
                exit;
                }
else
{

The problem is that the server logs an error 403 Access:
elitinstrument.ru 195.225.38.65 - powmab06 [11 / Feb / 2017: 00: 52: 54 +0300] "GET /index.php?option=com_jshopping&controller=checkout&task=step7&act=check&js_paymentclass=pm_gpb&trx_id=31D8DCED17F819F407BEBE78482D8EBF&lang_code=RU&merch_id=FD164EF79F423A61B6402F92E6A065FA&o.email= res% 2540res.ru & o.total_end = 2750.0 & o.order_id = 169 & ts = 20,170,211 + 00% 253A55% 253A04 HTTP / 1.1 "403 676" - "" Java / 1.8.0_121 "0

Question: where you must register Basic authentication, basic authentication is passed to and reach the 7 Steps?[

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