curl --request POST \
  --url https://api.blazemonitors.com/items \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: <api-key>' \
  --data '
{
  "items": [
    {
      "itemId": "B09DFHJTF5",
      "config": {
        "monitorPrice": true,
        "priceAlertMaxPrice": 450
      }
    },
    {
      "itemId": "B09DFCB66S"
    }
  ]
}
'

import requests

url = "https://api.blazemonitors.com/items"

payload = { "items": [{
            "itemId": "B09DFHJTF5",
            "config": {
                "monitorPrice": True,
                "priceAlertMaxPrice": 450
            }
        }, { "itemId": "B09DFCB66S" }] }
headers = {
    "X-Api-Key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-Api-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    items: [
      {itemId: 'B09DFHJTF5', config: {monitorPrice: true, priceAlertMaxPrice: 450}},
      {itemId: 'B09DFCB66S'}
    ]
  })
};

fetch('https://api.blazemonitors.com/items', 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.blazemonitors.com/items",
  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([
    'items' => [
        [
                'itemId' => 'B09DFHJTF5',
                'config' => [
                                'monitorPrice' => true,
                                'priceAlertMaxPrice' => 450
                ]
        ],
        [
                'itemId' => 'B09DFCB66S'
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-Api-Key: <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.blazemonitors.com/items"

	payload := strings.NewReader("{\n  \"items\": [\n    {\n      \"itemId\": \"B09DFHJTF5\",\n      \"config\": {\n        \"monitorPrice\": true,\n        \"priceAlertMaxPrice\": 450\n      }\n    },\n    {\n      \"itemId\": \"B09DFCB66S\"\n    }\n  ]\n}")

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

	req.Header.Add("X-Api-Key", "<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.blazemonitors.com/items")
  .header("X-Api-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"items\": [\n    {\n      \"itemId\": \"B09DFHJTF5\",\n      \"config\": {\n        \"monitorPrice\": true,\n        \"priceAlertMaxPrice\": 450\n      }\n    },\n    {\n      \"itemId\": \"B09DFCB66S\"\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.blazemonitors.com/items")

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

request = Net::HTTP::Post.new(url)
request["X-Api-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"items\": [\n    {\n      \"itemId\": \"B09DFHJTF5\",\n      \"config\": {\n        \"monitorPrice\": true,\n        \"priceAlertMaxPrice\": 450\n      }\n    },\n    {\n      \"itemId\": \"B09DFCB66S\"\n    }\n  ]\n}"

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

{
  "site": {
    "platformName": "amazon",
    "siteName": "AmazonUS",
    "siteUrl": "https://amazon.com",
    "siteCurrency": "USD",
    "siteImg": "https://drive.google.com/uc?id=1AoYw0yB47Kh8RQFXDDBUKRIhH1U3bxVC",
    "hasLists": true,
    "hasProducts": true,
    "hasReleases": false,
    "hasForceAdd": true,
    "queryType": "productSku",
    "restockTypes": [
      "Restock"
    ],
    "altNames": [
      "amazon",
      "amz",
      "amzus"
    ]
  },
  "results": {}
}

{
  "status": 400,
  "message": "Invalid JSON format"
}

{
  "status": 401,
  "message": "authentication failed"
}