curl --request POST \
  --url https://api.v3.tatango.com/transactional_messages/send_rcs_text \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "phoneNumber": "+14803585269",
  "webhookUrl": "https://webhook.site/e5b3a6c2-ffe1-4efc-922c-2f6e8aaaa49f",
  "rcsPayload": {
    "text": "Hello world, this my RCS Text message."
  },
  "smsFailover": "Hello world, this is my SMS fallback in case RCS delivery fails."
}
'

import requests

url = "https://api.v3.tatango.com/transactional_messages/send_rcs_text"

payload = {
    "phoneNumber": "+14803585269",
    "webhookUrl": "https://webhook.site/e5b3a6c2-ffe1-4efc-922c-2f6e8aaaa49f",
    "rcsPayload": { "text": "Hello world, this my RCS Text message." },
    "smsFailover": "Hello world, this is my SMS fallback in case RCS delivery fails."
}
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({
    phoneNumber: '+14803585269',
    webhookUrl: 'https://webhook.site/e5b3a6c2-ffe1-4efc-922c-2f6e8aaaa49f',
    rcsPayload: {text: 'Hello world, this my RCS Text message.'},
    smsFailover: 'Hello world, this is my SMS fallback in case RCS delivery fails.'
  })
};

fetch('https://api.v3.tatango.com/transactional_messages/send_rcs_text', 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.v3.tatango.com/transactional_messages/send_rcs_text",
  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([
    'phoneNumber' => '+14803585269',
    'webhookUrl' => 'https://webhook.site/e5b3a6c2-ffe1-4efc-922c-2f6e8aaaa49f',
    'rcsPayload' => [
        'text' => 'Hello world, this my RCS Text message.'
    ],
    'smsFailover' => 'Hello world, this is my SMS fallback in case RCS delivery fails.'
  ]),
  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.v3.tatango.com/transactional_messages/send_rcs_text"

	payload := strings.NewReader("{\n  \"phoneNumber\": \"+14803585269\",\n  \"webhookUrl\": \"https://webhook.site/e5b3a6c2-ffe1-4efc-922c-2f6e8aaaa49f\",\n  \"rcsPayload\": {\n    \"text\": \"Hello world, this my RCS Text message.\"\n  },\n  \"smsFailover\": \"Hello world, this is my SMS fallback in case RCS delivery fails.\"\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.v3.tatango.com/transactional_messages/send_rcs_text")
  .header("x-api-key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"phoneNumber\": \"+14803585269\",\n  \"webhookUrl\": \"https://webhook.site/e5b3a6c2-ffe1-4efc-922c-2f6e8aaaa49f\",\n  \"rcsPayload\": {\n    \"text\": \"Hello world, this my RCS Text message.\"\n  },\n  \"smsFailover\": \"Hello world, this is my SMS fallback in case RCS delivery fails.\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.v3.tatango.com/transactional_messages/send_rcs_text")

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  \"phoneNumber\": \"+14803585269\",\n  \"webhookUrl\": \"https://webhook.site/e5b3a6c2-ffe1-4efc-922c-2f6e8aaaa49f\",\n  \"rcsPayload\": {\n    \"text\": \"Hello world, this my RCS Text message.\"\n  },\n  \"smsFailover\": \"Hello world, this is my SMS fallback in case RCS delivery fails.\"\n}"

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

{
  "message": "Request accepted, sending message to recipient",
  "transactionId": "019687e1-1b54-70f4-a68a-60af7fa776f4"
}

{
  "$ref": "#/components/examples/PhoneNumberValidationError/value"
}