C2B validation using CallBacks

[Alecckie]

Following your tutorial, this is how you get data from the mpesa_callbacks to our controller n then to model public function c2b() { $data['response_body'] = $this->mpesa_callbacks->processSTKPushRequestCallback(); $this->test_model->insert($data); }

Now, if I wanted to use one of the variables to actually perform my validation before sending a response to confirm or reject payment, how would I extract that info from the variable $data

Like maybe $sent_pay = $data->$transAmount;

[Mwangangi]

You can do a simple print_r($data) to see all the elements in that response array

[Alecckie]

Then I'm constantly getting this error whenever I call the $data['response_body'] = $this->mpesa_callbacks->processC2BRequestValidation(); ... It makes the whole validation function fail

[Alecckie]

You can do a simple print_r($data) to see all the elements in that response array

print_r($data); returns an empty array

[Mwangangi]

Mpesa response with ResultCode: 1 means Insufficient Funds.

[Mwangangi]

Mpesa response with ResultCode: 1 means Insufficient Funds.

Check a detailed description of all possible responses here https://developer.safaricom.co.ke/docs?php#m-pesa-result-and-response-codes

[Alecckie]

In this case, the resulcode is hardored for this testing. I think the main error is in the callBack function

$data['response_body'] = $this->mpesa_callbacks->processC2BRequestValidation();
        print_r($data);
        $amount= $data['0']["transAmount"];

        if($amount == '1030.00'){
            echo '{"ResultCode":0, "ResultDesc":"Payment validated successfully", "ThirdPartyTransID": 0}';
        }
        else{
            echo '{"ResultCode":1, "ResultDesc":"Reject payment", "ThirdPartyTransID": 0}';
        }

[Mwangangi]

Is this now working for you? Let me know or just create a pull request and I'll review it then merge.

[Alecckie]

This is what worked for me. I opted not to use the callback but you can use this to see how to make the callback work `function validate_customer_to_business(){ header("Content-Type:application/json");

 function validate_customer_to_business(){
        header("Content-Type:application/json"); 
        $callbackJSONData = file_get_contents('php://input');
    $callbackData = json_decode($callbackJSONData,true);

    $transactionType = $callbackData["TransactionType"];
    $transID = $callbackData["TransID"];
    $transTime = $callbackData["TransTime"];
    $transAmount = $callbackData["TransAmount"];
    $businessShortCode = $callbackData["BusinessShortCode"];
    $billRefNumber = $callbackData["BillRefNumber"];
    $invoiceNumber = $callbackData["InvoiceNumber"];
    $orgAccountBalance = $callbackData["OrgAccountBalance"];
    $thirdPartyTransID = $callbackData["ThirdPartyTransID"];
    $MSISDN = $callbackData["MSISDN"];
    $firstName = $callbackData["FirstName"];
    $middleName = $callbackData["MiddleName"];
    $lastName = $callbackData["LastName"];

    //The log  (Very optional...used it just to see the actual response from saf) 
    $logFile= 'mpesa_validation_c2b.txt';

    //Write to file
    $log=fopen($logFile,"a+");
    fwrite($log,$callbackJSONData);
    fclose($log);

    if($transAmount == "1200.00"){ //For testing purposes...in production, we will perform actual validation
        echo '{"ResultCode":0, "ResultDesc":"Payment validated successfully", "ThirdPartyTransID": 0}';
    }
    else{
        echo '{"ResultCode":1, "ResultDesc":"Reject payment", "ThirdPartyTransID": 0}';
    }
}`

This was the response of the c2b simulation on validation using the above function

[Mwangangi]

Hello Alex, the callback function works as expected. Yours also works as expected. After viewing your code, I noticed that the error came from how the json_decode function was being invoked. The callback decodes the response body into an object but you tried to access it as an associative array. To decode the array into an associative array, pass a second argument to the function call i.e json_decode($response_data, true)