const response = await fetch('https://api.emailit.com/v2/sending-domains/sd_1234567890/verify', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer em_test_51RxCWJ...vS00p61e0qRE',
    'Content-Type': 'application/json'
  }
});

const result = await response.json();

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => 'https://api.emailit.com/v2/sending-domains/sd_1234567890/verify',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => 'POST',
  CURLOPT_HTTPHEADER => [
    'Authorization: Bearer em_test_51RxCWJ...vS00p61e0qRE',
    'Content-Type: application/json'
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  $result = json_decode($response, true);
  print_r($result);
}

import requests

response = requests.post(
    'https://api.emailit.com/v2/sending-domains/sd_1234567890/verify',
    headers={
        'Authorization': 'Bearer em_test_51RxCWJ...vS00p61e0qRE',
        'Content-Type': 'application/json'
    }
)

result = response.json()
print(result)

require 'net/http'
require 'json'

uri = URI('https://api.emailit.com/v2/sending-domains/sd_1234567890/verify')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true

request = Net::HTTP::Post.new(uri)
request['Authorization'] = 'Bearer em_test_51RxCWJ...vS00p61e0qRE'
request['Content-Type'] = 'application/json'

response = http.request(request)
result = JSON.parse(response.body)
puts result

curl -X POST https://api.emailit.com/v2/sending-domains/sd_1234567890/verify \
  -H "Authorization: Bearer em_test_51RxCWJ...vS00p61e0qRE" \
  -H "Content-Type: application/json"

{
  "object": "sending_domain",
  "id": 1234567890,
  "uuid": "sd_1234567890",
  "name": "mail.yourdomain.com",
  "verification_token": "abc123def456",
  "verification_method": "dns",
  "verified_at": "2021-01-01T12:00:00Z",
  "dkim_identifier_string": "emailit._domainkey",
  "dns_checked_at": "2021-01-01T12:00:00Z",
  "spf_status": "ok",
  "spf_error": null,
  "dkim_status": "ok",
  "dkim_error": null,
  "mx_status": "ok",
  "mx_error": null,
  "return_path_status": "ok",
  "return_path_error": null,
  "dmarc_status": "ok",
  "dmarc_error": null,
  "track_loads": 0,
  "track_clicks": 0,
  "dns_records": [
    {
      "required": true,
      "type": "MX",
      "name": "mail.yourdomain.com",
      "ttl": "auto",
      "status": "ok",
      "value": "feedback-smtp.ffdc-1.emailit.com",
      "priority": 10,
      "error": null
    },
    {
      "required": true,
      "type": "TXT",
      "name": "mail.yourdomain.com",
      "ttl": "auto",
      "status": "ok",
      "value": "v=spf1 include:_spf.emailit.com ~all",
      "priority": null,
      "error": null
    },
    {
      "required": true,
      "type": "TXT",
      "name": "emailit._domainkey.yourdomain.com",
      "ttl": "auto",
      "status": "ok",
      "value": "v=DKIM1; t=s; h=sha256; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC+hb3/Ew7dLpCYVAThs29xMy2aWDPhhdMarieUn/N6x8DOaMar3BQV3ilzUb5F+axVxSYisd6mw9FGuZ48uD2KcOXBWjl5E1R5pYuB13KuVwXUwyzsEeYsGE6kYIpu7Rxn3wQvcGhCrx3RK30Hyw0yNpAcpUtmo+wbIYkJutOquwIDAQAB;",
      "priority": null,
      "error": null
    },
    {
      "required": false,
      "type": "TXT",
      "name": "_dmarc.yourdomain.com",
      "ttl": "auto",
      "status": "ok",
      "value": "v=DMARC1; p=none;",
      "priority": null,
      "error": null
    }
  ],
  "created_at": "2021-01-01T00:00:00Z",
  "updated_at": "2021-01-01T12:00:00Z"
}

{
  "object": "sending_domain",
  "id": 1234567890,
  "uuid": "sd_1234567890",
  "name": "mail.yourdomain.com",
  "verification_token": "abc123def456",
  "verification_method": "dns",
  "verified_at": null,
  "dkim_identifier_string": "emailit._domainkey",
  "dns_checked_at": "2021-01-01T12:00:00Z",
  "spf_status": "failed",
  "spf_error": "SPF record not found",
  "dkim_status": "failed",
  "dkim_error": "DKIM record not found",
  "mx_status": "ok",
  "mx_error": null,
  "return_path_status": "ok",
  "return_path_error": null,
  "dmarc_status": "pending",
  "dmarc_error": null,
  "track_loads": 0,
  "track_clicks": 0,
  "dns_records": [
    {
      "required": true,
      "type": "MX",
      "name": "mail.yourdomain.com",
      "ttl": "auto",
      "status": "ok",
      "value": "feedback-smtp.ffdc-1.emailit.com",
      "priority": 10,
      "error": null
    },
    {
      "required": true,
      "type": "TXT",
      "name": "mail.yourdomain.com",
      "ttl": "auto",
      "status": "failed",
      "value": "v=spf1 include:_spf.emailit.com ~all",
      "priority": null,
      "error": "SPF record not found"
    },
    {
      "required": true,
      "type": "TXT",
      "name": "emailit._domainkey.yourdomain.com",
      "ttl": "auto",
      "status": "failed",
      "value": "v=DKIM1; t=s; h=sha256; p=MIGfMA....",
      "priority": null,
      "error": "DKIM record not found"
    },
    {
      "required": false,
      "type": "TXT",
      "name": "_dmarc.yourdomain.com",
      "ttl": "auto",
      "status": "pending",
      "value": "v=DMARC1; p=none;",
      "priority": null,
      "error": null
    }
  ],
  "created_at": "2021-01-01T00:00:00Z",
  "updated_at": "2021-01-01T12:00:00Z"
}

{
  "error": {
    "code": 401,
    "message": "Unauthorized"
  }
}

{
  "error": {
    "code": 404,
    "message": "Sending domain not found"
  }
}