curl --request POST \
  --url https://api.steppay.kr/api/v1/invoices \
  --header 'Content-Type: application/json' \
  --header 'Secret-Token: <api-key>' \
  --data '
{
  "customerId": 1,
  "items": [
    {
      "productCode": "<string>",
      "priceCode": "<string>",
      "minimumQuantity": 123,
      "maximumQuantity": 123,
      "productName": "<string>",
      "price": 123
    }
  ],
  "publishType": "NOW",
  "publishMethods": [],
  "invoicePayMethods": [],
  "discount": 0,
  "purchaseDeadline": "2023-11-07T05:31:56Z",
  "reservationAt": "2023-11-07T05:31:56Z",
  "instantAmount": 1,
  "memoToCustomer": "<string>",
  "currency": "<string>"
}
'

import requests

url = "https://api.steppay.kr/api/v1/invoices"

payload = {
    "customerId": 1,
    "items": [
        {
            "productCode": "<string>",
            "priceCode": "<string>",
            "minimumQuantity": 123,
            "maximumQuantity": 123,
            "productName": "<string>",
            "price": 123
        }
    ],
    "publishType": "NOW",
    "publishMethods": [],
    "invoicePayMethods": [],
    "discount": 0,
    "purchaseDeadline": "2023-11-07T05:31:56Z",
    "reservationAt": "2023-11-07T05:31:56Z",
    "instantAmount": 1,
    "memoToCustomer": "<string>",
    "currency": "<string>"
}
headers = {
    "Secret-Token": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'Secret-Token': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    customerId: 1,
    items: [
      {
        productCode: '<string>',
        priceCode: '<string>',
        minimumQuantity: 123,
        maximumQuantity: 123,
        productName: '<string>',
        price: 123
      }
    ],
    publishType: 'NOW',
    publishMethods: [],
    invoicePayMethods: [],
    discount: 0,
    purchaseDeadline: '2023-11-07T05:31:56Z',
    reservationAt: '2023-11-07T05:31:56Z',
    instantAmount: 1,
    memoToCustomer: '<string>',
    currency: '<string>'
  })
};

fetch('https://api.steppay.kr/api/v1/invoices', 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.steppay.kr/api/v1/invoices",
  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([
    'customerId' => 1,
    'items' => [
        [
                'productCode' => '<string>',
                'priceCode' => '<string>',
                'minimumQuantity' => 123,
                'maximumQuantity' => 123,
                'productName' => '<string>',
                'price' => 123
        ]
    ],
    'publishType' => 'NOW',
    'publishMethods' => [
        
    ],
    'invoicePayMethods' => [
        
    ],
    'discount' => 0,
    'purchaseDeadline' => '2023-11-07T05:31:56Z',
    'reservationAt' => '2023-11-07T05:31:56Z',
    'instantAmount' => 1,
    'memoToCustomer' => '<string>',
    'currency' => '<string>'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "Secret-Token: <api-key>"
  ],
]);

$response = curl_exec($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.steppay.kr/api/v1/invoices"

	payload := strings.NewReader("{\n  \"customerId\": 1,\n  \"items\": [\n    {\n      \"productCode\": \"<string>\",\n      \"priceCode\": \"<string>\",\n      \"minimumQuantity\": 123,\n      \"maximumQuantity\": 123,\n      \"productName\": \"<string>\",\n      \"price\": 123\n    }\n  ],\n  \"publishType\": \"NOW\",\n  \"publishMethods\": [],\n  \"invoicePayMethods\": [],\n  \"discount\": 0,\n  \"purchaseDeadline\": \"2023-11-07T05:31:56Z\",\n  \"reservationAt\": \"2023-11-07T05:31:56Z\",\n  \"instantAmount\": 1,\n  \"memoToCustomer\": \"<string>\",\n  \"currency\": \"<string>\"\n}")

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

	req.Header.Add("Secret-Token", "<api-key>")
	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.steppay.kr/api/v1/invoices")
  .header("Secret-Token", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"customerId\": 1,\n  \"items\": [\n    {\n      \"productCode\": \"<string>\",\n      \"priceCode\": \"<string>\",\n      \"minimumQuantity\": 123,\n      \"maximumQuantity\": 123,\n      \"productName\": \"<string>\",\n      \"price\": 123\n    }\n  ],\n  \"publishType\": \"NOW\",\n  \"publishMethods\": [],\n  \"invoicePayMethods\": [],\n  \"discount\": 0,\n  \"purchaseDeadline\": \"2023-11-07T05:31:56Z\",\n  \"reservationAt\": \"2023-11-07T05:31:56Z\",\n  \"instantAmount\": 1,\n  \"memoToCustomer\": \"<string>\",\n  \"currency\": \"<string>\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.steppay.kr/api/v1/invoices")

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

request = Net::HTTP::Post.new(url)
request["Secret-Token"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"customerId\": 1,\n  \"items\": [\n    {\n      \"productCode\": \"<string>\",\n      \"priceCode\": \"<string>\",\n      \"minimumQuantity\": 123,\n      \"maximumQuantity\": 123,\n      \"productName\": \"<string>\",\n      \"price\": 123\n    }\n  ],\n  \"publishType\": \"NOW\",\n  \"publishMethods\": [],\n  \"invoicePayMethods\": [],\n  \"discount\": 0,\n  \"purchaseDeadline\": \"2023-11-07T05:31:56Z\",\n  \"reservationAt\": \"2023-11-07T05:31:56Z\",\n  \"instantAmount\": 1,\n  \"memoToCustomer\": \"<string>\",\n  \"currency\": \"<string>\"\n}"

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

{
  "id": 123
}

{
  "errorCode": "<string>",
  "traceId": "<string>",
  "errorMessage": "<string>",
  "details": {}
}

{
  "errorCode": "<string>",
  "traceId": "<string>",
  "errorMessage": "<string>",
  "details": {}
}