curl --request GET \
  --url https://api.sendpadi.com/api/v1/merchant/gift-cards/sell/countries \
  --header 'X-Api-Key: <api-key>' \
  --header 'X-Signature: <x-signature>' \
  --header 'X-Timestamp: <x-timestamp>'

const options = {
  method: 'GET',
  headers: {
    'X-Timestamp': '<x-timestamp>',
    'X-Signature': '<x-signature>',
    'X-Api-Key': '<api-key>'
  }
};

fetch('https://api.sendpadi.com/api/v1/merchant/gift-cards/sell/countries', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.sendpadi.com/api/v1/merchant/gift-cards/sell/countries"

headers = {
    "X-Timestamp": "<x-timestamp>",
    "X-Signature": "<x-signature>",
    "X-Api-Key": "<api-key>"
}

response = requests.get(url, headers=headers)

print(response.text)

{
  "success": true,
  "message": "OK",
  "data": {
    "items": []
  }
}