PayPalRestSDK: Mock Response Instrument_Declined response when capturing order - laravel

Question

I've been struggling to mock the 'INSTRUMENT_DECLINED' issue, which according to Paypal is an usual error after attempting to capture an order (https://developer.paypal.com/demo/checkout/#/pattern/server).
Correctly setting the header to mock the response will help me to simulate other errors from the docs https://developer.paypal.com/docs/business/test-and-go-live/simulation-tests/#orders.
I'm using Laravel back end and React front end.
I have already gotten the expected mocked response using axios and calling in the front-end:
return axios
.post(
`https://api-m.sandbox.paypal.com/v2/checkout/orders/${orderID}/capture`,
{},
{
headers: {
"Content-Type": "application/json",
Authorization: "Bearer " + accessToken,
"PayPal-Mock-Response":
'{"mock_application_codes":"INSTRUMENT_DECLINED"}',
},
}
)
.then((res) => {
console.log(res);
})
However, I don't want to expose accessToken into the front end, I'd prefer to do everything in the back-end with GuzzleHtttp.
I've already had a positive response - with 'status': 'COMPLETED' without adding PayPal-Mock-Response header like so:
$client = new \GuzzleHttp\Client();
$response = $client->request(
'POST',
'https://api-m.sandbox.paypal.com/v2/checkout/orders/' . $paypalOrderId . '/capture',
[
'headers' => [
'Content-Type' => 'application/json',
'Authorization' => 'Bearer ' . $access_token,
// 'PayPal-Mock-Response' => json_encode(["mock_application_codes" => "INSTRUMENT_DECLINED"]),
// 'PayPal-Mock-Response' => "['mock_application_codes':'INSTRUMENT_DECLINED]",
],
],
);
$data = json_decode($response->getBody(), true);
But when adding the PayPal-Mock-Response header like shown in the commented code from above, both attemps have returned this exception:
"message": "Client error: POST https://api-m.sandbox.paypal.com/v2/checkout/orders/9HG50866FU785784C/capture
resulted in a 404 Not Found response",
"exception": "GuzzleHttp\Exception\ClientException",
"file": "C:\xampp\htdocs\react\React-Laravel\vinos-gdl\vendor\guzzlehttp\guzzle\src\Exception\RequestException.php",
This exception, I'm sure has to do to the way I'm passing the PayPal-Mock-Response header into the Guzzle http call but I can't find the way to do it correctly.
Any help is much appreciated.
UPDATE SOLVED**
Ok the way to go is sending the header like so:
'PayPal-Mock-Response' => json_encode(["mock_application_codes" => "INSTRUMENT_DECLINED"]),
I dunno if I had any typo but I finally got it. I also used INTERNAL_SERVER_ERROR to get a 500 response from server and built a catch for every situation:
} catch (ClientException $e) {
if ($e->hasResponse()) {
return response()->json([
'msg' => 'Client Exception',
'error' => json_decode($e->getResponse()->getBody()),
], 400);
}
return response()->json([
'msg' => 'Client Exception',
'request' => $e->getRequest(),
$e->hasResponse() ? $e->getResponse() : ""
]);
// return response()->json(['msg' => 'Server Error', 'error' => report($e)]);
} catch (BadResponseException $e) {
if ($e->hasResponse()) {
return response()->json([
'msg' => 'Uknown Exception',
'error' => json_decode($e->getResponse()->getBody()),
], 500);
}
return response()->json([
'msg' => 'Uknown Exception',
'request' => $e->getRequest(),
$e->hasResponse() ? $e->getResponse() : ""
]);
}
Thanks for the ones who commented.

Answer 1

"PayPal-Mock-Response":
'{"mock_application_codes":"INSTRUMENT_DECLINED"}',
...
// 'PayPal-Mock-Response' => "['mock_application_codes':'INSTRUMENT_DECLINED]",
There is a difference betwen {} (JSON object) and [] (JSON array).
What you have inside the brackets is not an array, so its syntax is invalid. It doesn't map to anything PayPal expects, hence the 404.