curl --request POST \
  --url https://cloudapi.mailercloud.com/v2/placement/tests \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: <content-type>' \
  --data '
{
  "campaign_id": "Hws",
  "provider_ids": [
    "1",
    "2"
  ]
}
'

import requests

url = "https://cloudapi.mailercloud.com/v2/placement/tests"

payload = {
    "campaign_id": "Hws",
    "provider_ids": ["1", "2"]
}
headers = {
    "Content-Type": "<content-type>",
    "Authorization": "<api-key>"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': '<content-type>', Authorization: '<api-key>'},
  body: JSON.stringify({campaign_id: 'Hws', provider_ids: ['1', '2']})
};

fetch('https://cloudapi.mailercloud.com/v2/placement/tests', 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://cloudapi.mailercloud.com/v2/placement/tests",
  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([
    'campaign_id' => 'Hws',
    'provider_ids' => [
        '1',
        '2'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: <api-key>",
    "Content-Type: <content-type>"
  ],
]);

$response = curl_exec($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://cloudapi.mailercloud.com/v2/placement/tests"

	payload := strings.NewReader("{\n  \"campaign_id\": \"Hws\",\n  \"provider_ids\": [\n    \"1\",\n    \"2\"\n  ]\n}")

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

	req.Header.Add("Content-Type", "<content-type>")
	req.Header.Add("Authorization", "<api-key>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

{
  "data": {
    "test_id": "<string>",
    "status": "running",
    "started_at": "2023-11-07T05:31:56Z",
    "seeds_total": 123,
    "tests_left": 123,
    "eta_at": "2023-11-07T05:31:56Z",
    "eta_seconds": 123
  }
}

{
  "error": "<string>",
  "code": "INVALID_INPUT"
}

{
  "error": "<string>",
  "code": "ADDON_INACTIVE"
}

{
  "error": "<string>",
  "code": "CAMPAIGN_NOT_FOUND"
}

{
  "error": "<string>",
  "code": "CAMPAIGN_TYPE_UNSUPPORTED",
  "resets_on": "<string>",
  "test_id": "<string>"
}

{
  "error": "<string>",
  "code": "PLACEMENT_UNAVAILABLE"
}