I need some help to resolve below php code. not sure what am i missing. I am trying to call an API through POST and in response i’m getting credentials are invalid. The same thing i tried in postman getting a response correctly. But with below code i with same credentials i’m getting a response as invalid credentials.

<?php
session_start();
error_reporting(E_ALL); // Set to show all errors for debugging

            
// Database connection (using PDO for this example)


// Fetch API username and password from the apiusers table
try {
    $sql = 'SELECT username, password FROM apiusers WHERE BPD_ID = :BPD_ID';
    $stmt = $pdo->prepare($sql);
    $stmt->bindParam(':BPD_ID', $BPD_ID);
    $stmt->execute();
    $user = $stmt->fetch(PDO::FETCH_ASSOC);

    $apiUsername = $user['username'];
    $apiPassword = $user['password'];
    
    // Display username and password in console
    echo "<script>console.log('Username: " . addslashes($apiUsername) . "');</script>";
    echo "<script>console.log('Password: " . addslashes($apiPassword) . "');</script>";
    
} catch (Exception $e) {
    die('Failed to fetch API user data: ' . $e->getMessage());
}

// Fetch data from the database

// Build the postData array
$postData = json_encode([
    "supplyType" => "O",
    "subSupplyType" => "8",
    "subSupplyDesc" => "DC",
    .........
    "vehicleType" => "R",
    "itemList" => $itemData
]);

// Output the request data to the console
echo "<pre>";
print_r($postData);
echo "</pre>";

echo "<pre>";
print_r($itemData);
echo "</pre>";

Full Request:

{
    "supplyType": "O",
    "subSupplyType": "8",
    "subSupplyDesc": "DELIVERY CHALLAN",
    "docType": "CHL",
    "docNo": "DC242501",
    "docDate": "01/08/2024",
    "fromGstin": "29AAFCC9980M1ZR",
    "fromTrdName": "welton",
    "fromAddr1": "2ND CROSS NO 59  19  A",
    "fromAddr2": "GROUND FLOOR OSBORNE ROAD",
    "fromPlace": "FRAZER TOWN",
    "fromPincode": 560090,
    "actFromStateCode": 29,
    "fromStateCode": 29,
    "toGstin": "29AEKPV7203E1Z9",
    "toTrdName": "sthuthya",
    "toAddr1": "Shree Nilaya",
    "toAddr2": "Dasarahosahalli",
    "toPlace": "Beml Nagar",
    "toPincode": 560090,
    "actToStateCode": 29,
    "toStateCode": 29,
    "transactionType": 1,
    "otherValue": "0",
    "totalValue": 40000,
    "cgstValue": 0,
    "sgstValue": 0,
    "igstValue": 0,
    "cessValue": 0,
    "cessNonAdvolValue": 0,
    "totInvValue": 47200,
    "transporterId": "",
    "transporterName": "",
    "transDocNo": "",
    "transMode": "1",
    "transDistance": "100",
    "transDocDate": "",
    "vehicleNo": "PVC1234",
    "vehicleType": "R",
    "itemList": [
        {
            "productName": "MS & SCRAP",
            "productDesc": "SCRAP",
            "hsnCode": 7402,
            "quantity": 4,
            "qtyUnit": "BOX",
            "cgstRate": 9,
            "sgstRate": 9,
            "igstRate": 0,
            "cessRate": 0,
            "cessNonadvol": 0,
            "taxableAmount": 40000
        }
    ]
}

// cURL setup

$url = 'https://my.gstzen.in/~gstzen/a/ewbapi/generate/?username=' . rawurlencode($apiUsername) . '&password=' . rawurlencode($apiPassword);
$apiKey = 'de3a3a01-273a-4a81-8b75-13fe37f14d';
$gstin = '29AAFCC9980M1'; // Your GSTIN value
/* $gstin = $mainData['COMP_GSTIN']; // Your GSTIN value */


// Initialize cURL session
$ch = curl_init($url);

// Set cURL options
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'Content-Type: application/json',
    'Authorization: API key ' . $apiKey,
    'gstin: ' . $gstin
]);

curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);

// Execute cURL request and get the response
$response = curl_exec($ch);

if (curl_errno($ch)) {
    echo 'cURL error: ' . curl_error($ch);
    exit;
}

curl_close($ch);

// Decode the JSON response
$responseData = json_decode($response, true);

if (json_last_error() !== JSON_ERROR_NONE) {
    die('JSON decode error: ' . json_last_error_msg());
}


// Debugging the API response
echo "<script>console.log('API Response: " . addslashes(json_encode($responseData)) . "');</script>";

// Check for authentication errors
if (isset($responseData['status']) && $responseData['status'] === 'error' && isset($responseData['message'])) {
    die('API error: ' . $responseData['message']);
}

// Insert data into the database 



    $pdo->commit();
    echo 'Data inserted successfully';
} catch (Exception $e) {
    $pdo->rollBack();
    echo 'Failed to insert data: ' . $e->getMessage();
}
?>

response from API call:

console.log('API Response: {\"status\":0,\"message\":\"The user credentials provided in the request are invalid.\"}');

Postman response is attached as image

Request JSON from Postman

{
    "supplyType": "O",
    "subSupplyType": "8",
    "subSupplyDesc": "DELIVERY CHALLAN",
    "docType": "CHL",
    "docNo": "DC242501",
    "docDate": "01/08/2024",
    "fromGstin": "29AAFCC9980M1ZR",
    "fromTrdName": "welton",
    "fromAddr1": "2ND CROSS NO 59  19  A",
    "fromAddr2": "GROUND FLOOR OSBORNE ROAD",
    "fromPlace": "FRAZER TOWN",
    "fromPincode": 560090,
    "actFromStateCode": 29,
    "fromStateCode": 29,
    "toGstin": "29AEKPV7203E1Z9",
    "toTrdName": "sthuthya",
    "toAddr1": "Shree Nilaya",
    "toAddr2": "Dasarahosahalli",
    "toPlace": "Beml Nagar",
    "toPincode": 560090,
    "actToStateCode": 29,
    "toStateCode": 29,
    "transactionType": 1,
    "otherValue": "0",
    "totalValue": 40000,
    "cgstValue": 0,
    "sgstValue": 0,
    "igstValue": 0,
    "cessValue": 0,
    "cessNonAdvolValue": 0,
    "totInvValue": 47200,
    "transporterId": "",
    "transporterName": "",
    "transDocNo": "",
    "transMode": "1",
    "transDistance": "100",
    "transDocDate": "",
    "vehicleNo": "PVC1234",
    "vehicleType": "R",
    "itemList": [
        {
            "productName": "MS & SCRAP",
            "productDesc": "SCRAP",
            "hsnCode": 7402,
            "quantity": 4,
            "qtyUnit": "BOX",
            "cgstRate": 9,
            "sgstRate": 9,
            "igstRate": 0,
            "cessRate": 0,
            "cessNonadvol": 0,
            "taxableAmount": 40000
        }
    ]
}

Reponse JSON from Postman

{
    "status": 1,
    "uuid": "cc1e4f5d-43ca-4373-9fd4-6e059fb6716a",
    "message": "EWB Generated",
    "alert": "",
    "validUpto": "06/08/2024 11:59:00 PM",
    "ewayBillNo": 171010516152,
    "ewayBillDate": "05/08/2024 07:16:00 PM",
    "EWayBillPdfUrl": "/~fnsjdjszvw/a/eway-bill/cc1e4f5d-43ca-4373-9fd4-6e059fb6716a/ewb/.pdf/",
    "EWayBillQrCodeUrl": "/~fnsjdjszvw/a/ewaybill/cc1e4f5d-43ca-4373-9fd4-6e059fb6716a/qr-code/",
    "Distance": "100"
}