Provide me with data structure and arguments operation for this project

[jaipalsin]

Codeigniter here
In the project, I am using Paytm payment gateway for the payment method and I want that when the user adds the item to the cart and goes to the checkout button, the user gets redirected to the user shipping address submission page where the user has to enter his Name, address, email, etc. have to be submitted. Once completed, the user will be redirected to the checkout process order page with the user ID and total amount where he can make the payment. What kind of logic and operation is required for this, I am not able to understand, please help me.

user shipping address submission

   $this->form_validation->set_rules('name', 'Name', 'required');
   $this->form_validation->set_rules('email', 'Email', 'required|valid_email');
   $this->form_validation->set_rules('password', 'Password', 'required');
   $this->form_validation->set_rules('phone', 'Phone', 'required');
   $this->form_validation->set_rules('address', 'Address', 'required');

checkout process order

$paramList["MID"] = PAYTM_MERCHANT_MID;
 $paramList["ORDER_ID"] = 'id';
 $paramList["CUST_ID"] = 'customer_id';
 $paramList["INDUSTRY_TYPE_ID"] = INDUSTRY_TYPE_ID;
 $paramList["CHANNEL_ID"] = $CHANNEL_ID;
 $paramList["TXN_AMOUNT"] = $item["subtotal"];
 $paramList["WEBSITE"] = PAYTM_MERCHANT_WEBSITE;

 $paramList["CALLBACK_URL"] = base_url('Checkout/payment_response');
 $paramList["MSISDN"] = 'xxxxxxxxxx'; //Mobile number of customer
 $paramList["EMAIL"] = 'xxxxxxxxxx'; //Email ID of customer
 $paramList["VERIFIED_BY"] = "MSISDN";
 $paramList["IS_USER_VERIFIED"] = "YES";

 $checkSum = $this->paytm->getChecksumFromArray($paramList,PAYTM_MERCHANT_KEY);
 $transaction_url = PAYTM_TXN_URL;
 $data = array('paramList' => $paramList,'transaction_url' => $transaction_url,'checkSum' => $checkSum);

 // ,'order_id' => $order_id
 $this->load->view('order_process',$data);

callback_URL

This is the callback_URL of the checkout process. Here I want if the payment status is successful then I should be shown the complete order information of the user according to the order ID submitted by the user

$paytmChecksum = "";
 $paramList = array();
 $isValidChecksum = FALSE;

 $paramList = $_POST;

 $paytmChecksum = isset($_POST["CHECKSUMHASH"]) ? $_POST["CHECKSUMHASH"] : ""; //Sent by Paytm pg

 $isValidChecksum = $this->paytm->verifychecksum_e($paramList, PAYTM_MERCHANT_KEY, $paytmChecksum); //will return TRUE or FALSE string.
  

 if($isValidChecksum == "TRUE") {
     if ($_POST["STATUS"] == "TXN_SUCCESS") {

     //Here we can show order information

     }else{
         echo 'Transaction Failed';
     }
 }else{
     echo 'Not Valid Check Sum';
 }

[bunglegrind]

Session to maintain user status and redirection to move across pages, I suppose. Or if you are a REST fan, model user state as a resource (instead of using the session) and PUT or POST state changes.

Try to clarify your mind with some sequence diagrams.

However, it's not related to codeigniter...

[jaipalsin]

HOW CAN I DO THIS CAN YOU PROVIDE ME WITH SOME CODE FOR THIS

[bunglegrind]

Sorry, I haven't code to show you. Just follow the suggestions I wrote above.