curl --location --request POST 'https://api.zixflow.com/api/v1/campaign/email/send' \
--header 'Authorization: Bearer 56616641ee123b80a36b99fedc2bfa4f0d7f63072d97ddb1578c7a5aa970e7edde6618c7f750beb921aee3eebc9cc48899ee992fa4eb95a663d0e0b2eaa35b73f3b2344c' \
--header 'Content-Type: application/json' \
--data-raw '{
    "to": [
        "sample@gmail.com"
    ],
    "subject": "API test 1",
    "from": "test@domain.com",
    "fromName": "sahil",
    "bodyHtml": "<h1>Test 1</h1>",
    "trackClicks": true,
    "trackOpens": true,
    "replyToEmail": "test2@domain2.com",
    "attachments": ["63a98c9c2b6df936ac930c17"],
    "replyToName": "sam",
    "bodyText": "Just Text Email",
    "reportUrl": "https://webhook.site/0a276bc5-f0e4-4235-9006-b58b7d224ad5"
}'

var axios = require("axios");
var data = JSON.stringify({
  to: ["sample@gmail.com"],
  subject: "API test 1",
  from: "test@domain.com",
  fromName: "sahil",
  bodyHtml: "<h1>Test 1</h1>",
  trackClicks: true,
  trackOpens: true,
  replyToEmail: "test2@domain2.com",
  attachments: ["63a98c9c2b6df936ac930c17"],
  replyToName: "sam",
  bodyText: "Just Text Email",
  reportUrl: "https://webhook.site/0a276bc5-f0e4-4235-9006-b58b7d224ad5",
});

var config = {
  method: "post",
  url: "https://api.zixflow.com/api/v1/campaign/email/send",
  headers: {
    Authorization:
      "Bearer 56616641ee123b80a36b99fedc2bfa4f0d7f63072d97ddb1578c7a5aa970e7edde6618c7f750beb921aee3eebc9cc48899ee992fa4eb95a663d0e0b2eaa35b73f3b2344c",
    "Content-Type": "application/json",
  },
  data: data,
};

axios(config)
  .then(function (response) {
    console.log(JSON.stringify(response.data));
  })
  .catch(function (error) {
    console.log(error);
  });

<?php
require_once 'HTTP/Request2.php';
$request = new HTTP_Request2();
$request->setUrl('https://api.zixflow.com/api/v1/campaign/email/send');
$request->setMethod(HTTP_Request2::METHOD_POST);
$request->setConfig(array(
  'follow_redirects' => TRUE
));
$request->setHeader(array(
  'Authorization' => 'Bearer 56616641ee123b80a36b99fedc2bfa4f0d7f63072d97ddb1578c7a5aa970e7edde6618c7f750beb921aee3eebc9cc48899ee992fa4eb95a663d0e0b2eaa35b73f3b2344c',
  'Content-Type' => 'application/json'
));
$request->setBody('{\n    "to": [\n        "sample@gmail.com"\n    ],\n    "subject": "API test 1",\n    "from": "test@domain.com",\n    "fromName": "sahil",\n    "bodyHtml": "<h1>Test 1</h1>",\n    "trackClicks": true,\n    "trackOpens": true,\n    "replyToEmail": "test2@domain2.com",\n    "attachments": ["63a98c9c2b6df936ac930c17"],\n    "replyToName": "sam",\n    "bodyText": "Just Text Email",\n    "reportUrl": "https://webhook.site/0a276bc5-f0e4-4235-9006-b58b7d224ad5"\n}');
try {
  $response = $request->send();
  if ($response->getStatus() == 200) {
    echo $response->getBody();
  }
  else {
    echo 'Unexpected HTTP status: ' . $response->getStatus() . ' ' .
    $response->getReasonPhrase();
  }
}
catch(HTTP_Request2_Exception $e) {
  echo 'Error: ' . $e->getMessage();
}

import requests
import json

url = "https://api.zixflow.com/api/v1/campaign/email/send"

payload = json.dumps({
  "to": [
    "sample@gmail.com"
  ],
  "subject": "API test 1",
  "from": "test@domain.com",
  "fromName": "sahil",
  "bodyHtml": "<h1>Test 1</h1>",
  "trackClicks": True,
  "trackOpens": True,
  "replyToEmail": "test2@domain2.com",
  "attachments": [
    "63a98c9c2b6df936ac930c17"
  ],
  "replyToName": "sam",
  "bodyText": "Just Text Email",
  "reportUrl": "https://webhook.site/0a276bc5-f0e4-4235-9006-b58b7d224ad5"
})
headers = {
  'Authorization': 'Bearer 56616641ee123b80a36b99fedc2bfa4f0d7f63072d97ddb1578c7a5aa970e7edde6618c7f750beb921aee3eebc9cc48899ee992fa4eb95a663d0e0b2eaa35b73f3b2344c',
  'Content-Type': 'application/json'
}

response = requests.request("POST", url, headers=headers, data=payload)

print(response.text)

OkHttpClient client = new OkHttpClient().newBuilder()
  .build();
MediaType mediaType = MediaType.parse("application/json");
RequestBody body = RequestBody.create(mediaType, "{\n    \"to\": [\n        \"sample@gmail.com\"\n    ],\n    \"subject\": \"API test 1\",\n    \"from\": \"test@domain.com\",\n    \"fromName\": \"sahil\",\n    \"bodyHtml\": \"<h1>Test 1</h1>\",\n    \"trackClicks\": true,\n    \"trackOpens\": true,\n    \"replyToEmail\": \"test2@domain2.com\",\n    \"attachments\": [\"63a98c9c2b6df936ac930c17\"],\n    \"replyToName\": \"sam\",\n    \"bodyText\": \"Just Text Email\",\n    \"reportUrl\": \"https://webhook.site/0a276bc5-f0e4-4235-9006-b58b7d224ad5\"\n}");
Request request = new Request.Builder()
  .url("https://api.zixflow.com/api/v1/campaign/email/send")
  .method("POST", body)
  .addHeader("Authorization", "Bearer 56616641ee123b80a36b99fedc2bfa4f0d7f63072d97ddb1578c7a5aa970e7edde6618c7f750beb921aee3eebc9cc48899ee992fa4eb95a663d0e0b2eaa35b73f3b2344c")
  .addHeader("Content-Type", "application/json")
  .build();
Response response = client.newCall(request).execute();

var headers = {
  'Authorization': 'Bearer 56616641ee123b80a36b99fedc2bfa4f0d7f63072d97ddb1578c7a5aa970e7edde6618c7f750beb921aee3eebc9cc48899ee992fa4eb95a663d0e0b2eaa35b73f3b2344c',
  'Content-Type': 'application/json'
};
var request = http.Request('POST', Uri.parse('https://api.zixflow.com/api/v1/campaign/email/send'));
request.body = json.encode({
  "to": [
    "sample@gmail.com"
  ],
  "subject": "API test 1",
  "from": "test@domain.com",
  "fromName": "sahil",
  "bodyHtml": "<h1>Test 1</h1>",
  "trackClicks": true,
  "trackOpens": true,
  "replyToEmail": "test2@domain2.com",
  "attachments": [
    "63a98c9c2b6df936ac930c17"
  ],
  "replyToName": "sam",
  "bodyText": "Just Text Email",
  "reportUrl": "https://webhook.site/0a276bc5-f0e4-4235-9006-b58b7d224ad5"
});
request.headers.addAll(headers);

http.StreamedResponse response = await request.send();

if (response.statusCode == 200) {
  print(await response.stream.bytesToString());
}
else {
  print(response.reasonPhrase);
}

{
  "status": true,
  "message": "Email sent successfully!"
}

{
  "status": false,
  "message": "to[1] must be a valid email"
}

{
  "status": false,
  "message": "No token provided"
}