curl --request POST \
  --url https://api.example.com/v1/cashier-ui/operations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'Idempotency-Key: <idempotency-key>' \
  --header 'X-Cashier-Instance-Id: <x-cashier-instance-id>' \
  --data '
{
  "amount": "25.00",
  "currency": "EUR",
  "expectedTotal": "25.50",
  "methodChoiceId": "<string>",
  "quoteId": "<string>",
  "fields": {}
}
'

import requests

url = "https://api.example.com/v1/cashier-ui/operations"

payload = {
    "amount": "25.00",
    "currency": "EUR",
    "expectedTotal": "25.50",
    "methodChoiceId": "<string>",
    "quoteId": "<string>",
    "fields": {}
}
headers = {
    "X-Cashier-Instance-Id": "<x-cashier-instance-id>",
    "Idempotency-Key": "<idempotency-key>",
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'X-Cashier-Instance-Id': '<x-cashier-instance-id>',
    'Idempotency-Key': '<idempotency-key>',
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    amount: '25.00',
    currency: 'EUR',
    expectedTotal: '25.50',
    methodChoiceId: '<string>',
    quoteId: '<string>',
    fields: {}
  })
};

fetch('https://api.example.com/v1/cashier-ui/operations', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.example.com/v1/cashier-ui/operations",
  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([
    'amount' => '25.00',
    'currency' => 'EUR',
    'expectedTotal' => '25.50',
    'methodChoiceId' => '<string>',
    'quoteId' => '<string>',
    'fields' => [
        
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json",
    "Idempotency-Key: <idempotency-key>",
    "X-Cashier-Instance-Id: <x-cashier-instance-id>"
  ],
]);

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

curl_close($curl);

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

package main

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

func main() {

	url := "https://api.example.com/v1/cashier-ui/operations"

	payload := strings.NewReader("{\n  \"amount\": \"25.00\",\n  \"currency\": \"EUR\",\n  \"expectedTotal\": \"25.50\",\n  \"methodChoiceId\": \"<string>\",\n  \"quoteId\": \"<string>\",\n  \"fields\": {}\n}")

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

	req.Header.Add("X-Cashier-Instance-Id", "<x-cashier-instance-id>")
	req.Header.Add("Idempotency-Key", "<idempotency-key>")
	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.example.com/v1/cashier-ui/operations")
  .header("X-Cashier-Instance-Id", "<x-cashier-instance-id>")
  .header("Idempotency-Key", "<idempotency-key>")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"amount\": \"25.00\",\n  \"currency\": \"EUR\",\n  \"expectedTotal\": \"25.50\",\n  \"methodChoiceId\": \"<string>\",\n  \"quoteId\": \"<string>\",\n  \"fields\": {}\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.example.com/v1/cashier-ui/operations")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["X-Cashier-Instance-Id"] = '<x-cashier-instance-id>'
request["Idempotency-Key"] = '<idempotency-key>'
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"amount\": \"25.00\",\n  \"currency\": \"EUR\",\n  \"expectedTotal\": \"25.50\",\n  \"methodChoiceId\": \"<string>\",\n  \"quoteId\": \"<string>\",\n  \"fields\": {}\n}"

response = http.request(request)
puts response.read_body

{
  "error": "RATE_LIMITED",
  "errorCode": "RATE_LIMITED",
  "message": "Too many requests. Retry after the indicated delay.",
  "status": false,
  "statusCode": 429
}

{
  "error": "DUPLICATE_ORDER_ID",
  "errorCode": "DUPLICATE_ORDER_ID",
  "message": "A transaction with orderId \"A-1001\" already exists for this merchant",
  "status": false,
  "statusCode": 409,
  "existingTransactionId": "tr_x8k2p0q5scocndpejk0nud75q",
  "fields": [
    "customer.email",
    "customer.country"
  ],
  "idempotencyKey": "0b6f2c1e-4c7a-4a43-9a51-6a4b1d7e9f10",
  "orderId": "A-1001"
}