Omnipay Paypal Express Checkout Error: Security header is not valid - laravel

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" => "2020-02-03T11:04:45Z"
"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"
]
}
---EDIT---
Just made a new Sandbox Business Account and used that one's NVP API Creds and then it worked! The old account's problem was probably it's email that I edited because that was the only difference between the old and new one.

The live and test/sandbox environments are completely separate, and so require separate credentials.
For the PayPal Sandbox (test mode), you need an API Username, Password, and Signature from a sandbox PayPal Business account, via https://www.paypal.com/signin?intent=developer&returnUri=https%3A%2F%2Fdeveloper.paypal.com%2Fdeveloper%2Faccounts%2F
The 10002 "Security Header is not Valid" always indicates your credentials are not valid, i.e. there is a problem with the Username/Password/Signature or you are using live ones in sandbox mode, or vice-versa

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=> App\Services\PaypalService {#3413}
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GuzzleHttp\Exception\ClientException with message 'Client error: `POST https://api-
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This is strange, because in Paypal API doc (see above), the 'name' param is described exactly like that!
Do I miss something or it is Paypal API is acting funky?
try this :
try {
// your code here
} catch(\Throwable $th) {
if ($th instanceof ClientException) {
$r = $th->getResponse();
$responseBodyAsString = json_decode($r->getBody()->getContents());
dd($responseBodyAsString);
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}
I've faced this too before and it was not easy for me to figure out how to show an explicit error message.
'return_url' => route('subscribe.approval', ['plan' => $planSlug]),
'cancel_url'=> route('subscribe.cancelled')
the problem is in this two url, may be you have changed the APP_URL in the .env
APP_URL=http://127.0.0.1:8000
put app url that and try

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Finally solved it!!
Turns out it was Apache on the Raspberry Pi server blocking the Authorization header. This finally unblocked me and solved my issues.
For anyone else coming from a Google search, you can go into your /etc/apache2/apache2.conf file and at the very bottom, paste:
SetEnvIf Authorization "(.*)" HTTP_AUTHORIZATION=$1
I am using a Raspberry Pi 4 with 32 bit PHP and Apache2.
Also, I didn't mention in my post that I have been using the following for my apache server root htaccess:
# Handle Authorization Header
RewriteCond %{HTTP:Authorization} .
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.htaccess file, server root

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