using RestSharp;


var options = new RestClientOptions("https://api.sandbox.{id}.gr4vy.app/gift-cards");
var client = new RestClient(options);
var request = new RestRequest("");
request.AddHeader("Authorization", "Bearer <token>");
request.AddJsonBody("{\n  \"number\": \"4123455541234561234\",\n  \"pin\": \"1234\"\n}", false);
var response = await client.PostAsync(request);

Console.WriteLine("{0}", response.Content);

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.sandbox.{id}.gr4vy.app/gift-cards"

	payload := strings.NewReader("{\n  \"number\": \"4123455541234561234\",\n  \"pin\": \"1234\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.sandbox.{id}.gr4vy.app/gift-cards")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"number\": \"4123455541234561234\",\n  \"pin\": \"1234\"\n}")
  .asString();

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.sandbox.{id}.gr4vy.app/gift-cards",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'number' => '4123455541234561234',
    'pin' => '1234'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

import requests

url = "https://api.sandbox.{id}.gr4vy.app/gift-cards"

payload = {
    "number": "4123455541234561234",
    "pin": "1234"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({number: '4123455541234561234', pin: '1234'})
};

fetch('https://api.sandbox.{id}.gr4vy.app/gift-cards', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

curl --request POST \
  --url https://api.sandbox.{id}.gr4vy.app/gift-cards \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "number": "4123455541234561234",
  "pin": "1234"
}
'

{
  "type": "gift-card",
  "id": "e6cdf979-87e2-4796-8ff6-9784d5aed893",
  "merchant_account_id": "default",
  "service": {
    "type": "gift-card-service",
    "id": "6c020bf3-179b-4f4f-858d-84e39e196e0f",
    "merchant_account_id": "default",
    "gift_card_service_definition_id": "qwikcilver-gift-card",
    "display_name": "Qwikcilver UK",
    "active": true,
    "fields": [
      {
        "key": "secret_key",
        "value": "sk_test_26PHem9AhJZvU623DfE1x4sd"
      }
    ],
    "created_at": "2012-12-12T10:53:43+00:00",
    "updated_at": "2012-12-12T10:53:43+00:00"
  },
  "bin": "412345",
  "sub_bin": "554",
  "last4": "1234",
  "expiration_date": "2013-07-16T19:23:00.000+00:00",
  "buyer": {
    "type": "buyer",
    "id": "fe26475d-ec3e-4884-9553-f7356683f7f9",
    "billing_details": {
      "type": "billing-details",
      "first_name": "John",
      "last_name": "Lunn",
      "email_address": "john@example.com",
      "phone_number": "+1234567890",
      "address": {
        "city": "London",
        "country": "GB",
        "postal_code": "789123",
        "state": "Greater London",
        "state_code": "GB-LND",
        "house_number_or_name": "10",
        "line1": "10 Oxford Street",
        "line2": "New Oxford Court",
        "organization": "Gr4vy"
      },
      "tax_id": {
        "value": "12345678931",
        "kind": "gb.vat"
      }
    },
    "created_at": "2013-07-16T19:23:00.000+00:00",
    "display_name": "John L.",
    "external_identifier": "user-789123",
    "merchant_account_id": "default",
    "updated_at": "2013-07-16T19:23:00.000+00:00",
    "account_number": "1234567"
  },
  "created_at": "2013-07-16T19:23:00.000+00:00",
  "updated_at": "2013-07-16T19:23:00.000+00:00"
}

{
  "type": "error",
  "code": "bad_request",
  "status": 400,
  "message": "Missing '****' field",
  "details": [
    {
      "location": "body",
      "type": "value_error.missing",
      "pointer": "/payment_method/number",
      "message": "field required"
    }
  ]
}

{
  "type": "error",
  "code": "unauthorized",
  "status": 401,
  "message": "No valid API authentication found",
  "details": []
}

{
  "type": "error",
  "code": "duplicate_record",
  "status": 409,
  "message": "A duplicate record exists with this external_identifier value",
  "details": []
}

{
  "type": "error",
  "code": "too_many_requests",
  "status": 429,
  "message": "Too many requests",
  "details": []
}