i am trying to send this json data to my controller but its not going can you please check it out for me? thanks in advance

// this is my script in form file

function verifyTransactionOnBackend(transactionId) { // console.log("Verifying transaction on backend, transaction ID:", transactionId);
    const postData = {
        transaction_id: transactionId,
        store_id: document.getElementById("store_id").value,
        plan_id: document.getElementById("plan_id").value,
        start_date: document.getElementById("start_date").value,
        end_date: document.getElementById("end_date").value,
        status: 'active',
        price: document.getElementById("price").value,
    };
    
    $.ajax({
        method: "POST",
        url: "<?php echo admin_url('membership/insert_user_payment')?>",
        data: postData, // No need to stringify if contentType is not set to "application/json"
        dataType: "json",
        success: function(response) {
            console.log("Server response:", response);
            if (response.status && response.status === 'success') {
                window.location.href = "<?php echo admin_url('welcome'); ?>";
            } else {
                console.error("Error in response:", response.msg || "Undefined error message");
                document.querySelector("#payment-failed").style.display = 'block';
            }
        },
        error: function(xhr, status, error) {
            console.error("Error:", error);
            document.querySelector("#payment-failed").style.display = 'block';
        }
    });
}

// this is my controller 
public function insert_user_payment() {    
    $postData = json_decode($this->input->raw_input_stream, true);
    
    // Prepare the data for insertion
    $insert_data = [
        'transaction_id' => $postData['transaction_id'],
        'tore_id' => $postData['store_id'],
        'plan_id' => $postData['plan_id'],
        'tart_date' => $postData['start_date'],
        'end_date' => $postData['end_date'],
        'tatus' => $postData['status'],
        'price' => $postData['price']
    ];

    var_dump($postData);
    
    $insert = $this->db->insert('membership_payments', $insert_data);
    
    // Check if the insert was successful
    if ($insert) {
        echo json_encode(['status' => 'uccess', 'sg' => 'Payment recorded successfully.']);
    } else {
        echo json_encode(['status' => 'error', 'sg' => 'Failed to record payment.']);
    }
}