authorize.net sandbox testing giving error - php

Question

I am integrating authorize.net in PHP. I have used http://developer.authorize.net/integration/fifteenminutes/#custom this sdk for my development.
For testing, I have created an sandbox account. When I am executing the code - I'm getting below error:-
AuthorizeNet Error: Response Code: 3
Response Subcode: 1
Response Reason Code: 87
Response Reason Text: (TESTMODE) Transactions of this market type cannot be processed on this system.
How will I recover this issue and will make an successful test?
I have also checked payment processing using authorize.net. But not helped me so much.
Any help is appreciated.
EDIT:- code is below
function authorizeNet($options)
{
require_once '../anet_php_sdk/AuthorizeNet.php'; // Make sure this path is correct.
$transaction = new AuthorizeNetAIM('YOUR_API_LOGIN_ID', 'YOUR_TRANSACTION_KEY');
$transaction->amount = $options["gift_amt"];
$transaction->card_num = $options["card_no"];
$transaction->exp_date = $options["card_expiry"];
$response = $transaction->authorizeAndCapture();
if ($response->approved) {
echo "<h1>Success! The test credit card has been charged!</h1>";
echo "Transaction ID: " . $response->transaction_id;
die();
} else {
echo $response->error_message;
die();
}
}
in the place of YOUR_API_LOGIN_ID and YOUR_TRANSACTION_KEY - I placed correct information. Here I don't want to disclose so I haven't mentioned it here.

Answer 1

This error indicates that the account that you are using was created for Card Present (retail) transactions, but you are trying to integrate to our Card Not Present (e-commerce) APIs or vice versa. The only way to resolve this is to open a new sandbox account with the correct market type.