Omnipay Paypal Express Checkout Error: Security header is not valid

I have searched around stack overflow and google in general and have not found a problem similar to mine.

The problem is whenever setTestMode() method is used the error “Security header is not valid” pops up.

But if I remove setTestMode() and just keep the setUsername(), setPassword(), and setSignature() methods, it goes through and redirects straight to paypal (Live Paypal).

So afaik the problem should lie in how I’m using setTestMode and not about incorrect Api Creds as most “Security header is not valid” errors are about.

I am currently using Laravel 5.8 with Omnipay/paypal using Paypal Express Checkout

Here are the files that were used

Paypal.php

public function gateway()
{
$gateway = Omnipay::create('PayPal_Express');

$gateway->setUsername(config('services.paypal.username'));
$gateway->setPassword(config('services.paypal.password'));
$gateway->setSignature(config('services.paypal.signature'));
$gateway->setTestMode(config('services.paypal.sandbox'));
// $gateway->setTestMode(true);

return $gateway;
}

public function purchase(array $parameters)
{
$response = $this->gateway()
->purchase($parameters)
->send();

return $response;
}

PaypalController.php

public function checkout($order_id)
{
$order = Order::findOrFail(decrypt($order_id));

$paypal = new PayPal;

$response = $paypal->purchase([
'amount' => $paypal->formatAmount($order->amount),
'transactionId' => $order->transaction_id,
'currency' => 'PHP',
'cancelUrl' => $paypal->getCancelUrl($order),
'returnUrl' => $paypal->getReturnUrl($order),
'notifyUrl' => $paypal->getNotifyUrl($order),
]);

if ($response->isRedirect()) {
$response->redirect();
}

return redirect()->back()->with([
'message' => $response->getMessage(),
]);
}

Here are the contents of the $response

ExpressAuthorizeResponse {#1098 ▼
#liveCheckoutEndpoint: "https://www.paypal.com/cgi-bin/webscr"
#testCheckoutEndpoint: "https://www.sandbox.paypal.com/cgi-bin/webscr"
#request: ExpressAuthorizeRequest {#1095 ▼
#liveEndpoint: "https://api-3t.paypal.com/nvp"
#testEndpoint: "https://api-3t.sandbox.paypal.com/nvp"
#negativeAmountAllowed: true
#parameters: ParameterBag {#1097 ▶}
#httpClient: Client {#1063 ▶}
#httpRequest: Request {#1086 ▶}
#response: ExpressAuthorizeResponse {#1098}
#currencies: ISOCurrencies {#1096}
#zeroAmountAllowed: true
}
#data: array:9 [▼
"TIMESTAMP" => "2022-02-03T11:04:45Z"
"CORRELATIONID" => "c8d066c9b5ccd"
"ACK" => "Failure"
"VERSION" => "119.0"
"BUILD" => "54118205"
"L_ERRORCODE0" => "10002"
"L_SHORTMESSAGE0" => "Security error"
"L_LONGMESSAGE0" => "Security header is not valid"
"L_SEVERITYCODE0" => "Error"
]
}

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