curl --request GET \
  --url "https://api.yukoapp.com/api/v1/public/customers/balance?customer_id=9049402769586" \
  --header "Authorization: Bearer py_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

const customerId = "9049402769586";

const response = await fetch(
  `https://api.yukoapp.com/api/v1/public/customers/balance?customer_id=${customerId}`,
  {
    method: "GET",
    headers: {
      Authorization: "Bearer py_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
    },
  }
);

const data = await response.json();

$customerId = "9049402769586";

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "https://api.yukoapp.com/api/v1/public/customers/balance?customer_id={$customerId}");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    "Authorization: Bearer py_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
]);

$response = curl_exec($ch);
curl_close($ch);

$data = json_decode($response, true);

{
  "data": {
    "customer_id": "9049402769586",
    "balance": 350,
    "earned": 500,
    "redeemed": 150
  }
}

{
  "error": {
    "code": "not_found",
    "message": "Customer not found"
  }
}

{
  "error": {
    "code": "invalid_token",
    "message": "Invalid or revoked API token"
  }
}