const response = await fetch(
  'https://service.pcibooking.net/api/credentials/paymentGateway/Stripe',
  {
    headers: {
      'Authorization': 'APIKEY your-api-key'
    }
  }
);

const data = await response.json();
console.log(data);

import requests

response = requests.get(
    'https://service.pcibooking.net/api/credentials/paymentGateway/Stripe',
    headers={
        'Authorization': 'APIKEY your-api-key'
    }
)

print(response.json())

[
    "MerchantId",
    "ApiKey",
    "SharedSecret"
]

{
    "code": -125,
    "message": "Bad input data",
    "moreInfo": "...",
    "errorList": null
}