curl --request POST \
  --url https://api.reply.io/v3/sequences/{id}/steps \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "type": "email",
  "delayInMinutes": 1,
  "variants": [
    {
      "id": 123,
      "subject": "<string>",
      "message": "<string>",
      "attachmentIds": [
        123
      ]
    }
  ],
  "parentId": 123,
  "ifConditionPositive": true
}
'

import requests

url = "https://api.reply.io/v3/sequences/{id}/steps"

payload = {
    "type": "email",
    "delayInMinutes": 1,
    "variants": [
        {
            "id": 123,
            "subject": "<string>",
            "message": "<string>",
            "attachmentIds": [123]
        }
    ],
    "parentId": 123,
    "ifConditionPositive": True
}
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({
    type: 'email',
    delayInMinutes: 1,
    variants: [{id: 123, subject: '<string>', message: '<string>', attachmentIds: [123]}],
    parentId: 123,
    ifConditionPositive: true
  })
};

fetch('https://api.reply.io/v3/sequences/{id}/steps', 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.reply.io/v3/sequences/{id}/steps",
  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([
    'type' => 'email',
    'delayInMinutes' => 1,
    'variants' => [
        [
                'id' => 123,
                'subject' => '<string>',
                'message' => '<string>',
                'attachmentIds' => [
                                123
                ]
        ]
    ],
    'parentId' => 123,
    'ifConditionPositive' => true
  ]),
  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;
}

package main

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

func main() {

	url := "https://api.reply.io/v3/sequences/{id}/steps"

	payload := strings.NewReader("{\n  \"type\": \"email\",\n  \"delayInMinutes\": 1,\n  \"variants\": [\n    {\n      \"id\": 123,\n      \"subject\": \"<string>\",\n      \"message\": \"<string>\",\n      \"attachmentIds\": [\n        123\n      ]\n    }\n  ],\n  \"parentId\": 123,\n  \"ifConditionPositive\": true\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.reply.io/v3/sequences/{id}/steps")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"type\": \"email\",\n  \"delayInMinutes\": 1,\n  \"variants\": [\n    {\n      \"id\": 123,\n      \"subject\": \"<string>\",\n      \"message\": \"<string>\",\n      \"attachmentIds\": [\n        123\n      ]\n    }\n  ],\n  \"parentId\": 123,\n  \"ifConditionPositive\": true\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.reply.io/v3/sequences/{id}/steps")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"type\": \"email\",\n  \"delayInMinutes\": 1,\n  \"variants\": [\n    {\n      \"id\": 123,\n      \"subject\": \"<string>\",\n      \"message\": \"<string>\",\n      \"attachmentIds\": [\n        123\n      ]\n    }\n  ],\n  \"parentId\": 123,\n  \"ifConditionPositive\": true\n}"

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