if (!isset($this->session->data[ 'shipping_methods' ]) || !$this->config->get('config_shipping_session')) {
         $quote_data = array();

         $results = $this->model_checkout_extension->getExtensions('shipping');
         foreach ($results as $result) {
            $this->loadModel('extension/' . $result[ 'key' ]);

            $quote = $this->{'model_extension_' . $result[ 'key' ]}->getQuote($shipping_address);

            if ($quote) {
               $quote_data[ $result[ 'key' ] ] = array(
                  'title' => $quote[ 'title' ],
                  'quote' => $quote[ 'quote' ],
                  'sort_order' => $quote[ 'sort_order' ],
                  'error' => $quote[ 'error' ]
               );
            }
         }

         $sort_order = array();

         foreach ($quote_data as $key => $value) {
            $sort_order[ $key ] = $value[ 'sort_order' ];
         }

         array_multisort($sort_order, SORT_ASC, $quote_data);

         $this->session->data[ 'shipping_methods' ] = $quote_data;
      }


this function from API print List of shipping methods when condition is true
can someone plz explain the line below?
 
!$this->config->get('config_shipping_session'))

I am trying to clarify the question. Are you expecting to see the same list all the time?

What version of Abantecart do you have?

im using an older version

dont know it is helpful or not for parveen now but may be helpful for someone else :-)
i solved this one
in 2nd step use
rt: a/account/account instead of rt: a/account/login
and we need to send cookies in headers that mainly include session and customer cookies that we received in step 1.

problem solved by sending data in x-www-form-urlencoded format