curl --request POST \
  --url https://api.centralcart.io/v1/app/upsell \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "offered_package_id": 305,
  "type": "ADDITIONAL",
  "trigger_package_ids": [
    301
  ],
  "offer_price": 9.9
}
'

import requests

url = "https://api.centralcart.io/v1/app/upsell"

payload = {
    "offered_package_id": 305,
    "type": "ADDITIONAL",
    "trigger_package_ids": [301],
    "offer_price": 9.9
}
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({
    offered_package_id: 305,
    type: 'ADDITIONAL',
    trigger_package_ids: [301],
    offer_price: 9.9
  })
};

fetch('https://api.centralcart.io/v1/app/upsell', 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.centralcart.io/v1/app/upsell",
  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([
    'offered_package_id' => 305,
    'type' => 'ADDITIONAL',
    'trigger_package_ids' => [
        301
    ],
    'offer_price' => 9.9
  ]),
  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.centralcart.io/v1/app/upsell"

	payload := strings.NewReader("{\n  \"offered_package_id\": 305,\n  \"type\": \"ADDITIONAL\",\n  \"trigger_package_ids\": [\n    301\n  ],\n  \"offer_price\": 9.9\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.centralcart.io/v1/app/upsell")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"offered_package_id\": 305,\n  \"type\": \"ADDITIONAL\",\n  \"trigger_package_ids\": [\n    301\n  ],\n  \"offer_price\": 9.9\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.centralcart.io/v1/app/upsell")

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  \"offered_package_id\": 305,\n  \"type\": \"ADDITIONAL\",\n  \"trigger_package_ids\": [\n    301\n  ],\n  \"offer_price\": 9.9\n}"

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

{
  "id": 123,
  "store_id": 123,
  "offered_package_id": 123,
  "type": "ADDITIONAL",
  "all_triggers": true,
  "offer_price": 123,
  "position": 123,
  "enabled": true,
  "created_at": "<string>",
  "updated_at": "<string>",
  "offered": {
    "id": 123,
    "name": "<string>",
    "image": "<string>",
    "price": 123,
    "slug": "<string>"
  },
  "triggers": [
    {
      "id": 123,
      "name": "<string>",
      "image": "<string>",
      "price": 123,
      "slug": "<string>"
    }
  ]
}