curl --request POST \
  --url https://api.swoogo.com/api/v1/registrants/token \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form event_id=49 \
  --form 'fields[email]=atomkiewicz@hotmail.com' \
  --form 'fields[first_name]=Aleshia' \
  --form 'fields[last_name]=Tomkiewicz' \
  --form 'fields[package_id]=11' \
  --form 'fields[reg_type_id]=20'

import requests

url = "https://api.swoogo.com/api/v1/registrants/token"

payload = "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"event_id\"\r\n\r\n49\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Bemail%5D\"\r\n\r\natomkiewicz@hotmail.com\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Bfirst_name%5D\"\r\n\r\nAleshia\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Blast_name%5D\"\r\n\r\nTomkiewicz\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Bpackage_id%5D\"\r\n\r\n11\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Breg_type_id%5D\"\r\n\r\n20\r\n-----011000010111000001101001--"
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "multipart/form-data"
}

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

print(response.text)

const form = new FormData();
form.append('event_id', '49');
form.append('fields[email]', 'atomkiewicz@hotmail.com');
form.append('fields[first_name]', 'Aleshia');
form.append('fields[last_name]', 'Tomkiewicz');
form.append('fields[package_id]', '11');
form.append('fields[reg_type_id]', '20');

const options = {method: 'POST', headers: {Authorization: 'Bearer <token>'}};

options.body = form;

fetch('https://api.swoogo.com/api/v1/registrants/token', 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.swoogo.com/api/v1/registrants/token",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"event_id\"\r\n\r\n49\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Bemail%5D\"\r\n\r\natomkiewicz@hotmail.com\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Bfirst_name%5D\"\r\n\r\nAleshia\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Blast_name%5D\"\r\n\r\nTomkiewicz\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Bpackage_id%5D\"\r\n\r\n11\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Breg_type_id%5D\"\r\n\r\n20\r\n-----011000010111000001101001--",
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: multipart/form-data"
  ],
]);

$response = curl_exec($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.swoogo.com/api/v1/registrants/token"

	payload := strings.NewReader("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"event_id\"\r\n\r\n49\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Bemail%5D\"\r\n\r\natomkiewicz@hotmail.com\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Bfirst_name%5D\"\r\n\r\nAleshia\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Blast_name%5D\"\r\n\r\nTomkiewicz\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Bpackage_id%5D\"\r\n\r\n11\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Breg_type_id%5D\"\r\n\r\n20\r\n-----011000010111000001101001--")

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

	req.Header.Add("Authorization", "Bearer <token>")

	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.swoogo.com/api/v1/registrants/token")
  .header("Authorization", "Bearer <token>")
  .body("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"event_id\"\r\n\r\n49\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Bemail%5D\"\r\n\r\natomkiewicz@hotmail.com\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Bfirst_name%5D\"\r\n\r\nAleshia\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Blast_name%5D\"\r\n\r\nTomkiewicz\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Bpackage_id%5D\"\r\n\r\n11\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Breg_type_id%5D\"\r\n\r\n20\r\n-----011000010111000001101001--")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.swoogo.com/api/v1/registrants/token")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request.body = "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"event_id\"\r\n\r\n49\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Bemail%5D\"\r\n\r\natomkiewicz@hotmail.com\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Bfirst_name%5D\"\r\n\r\nAleshia\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Blast_name%5D\"\r\n\r\nTomkiewicz\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Bpackage_id%5D\"\r\n\r\n11\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"fields%5Breg_type_id%5D\"\r\n\r\n20\r\n-----011000010111000001101001--"

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

{
  "event_id": 49,
  "id": "123",
  "token": "nXGTJ-SfjLbOWNXwh6xXQDuUYFhZ5puH_1482142194",
  "url": "https://client.swoogo.com/event/resume?i=nXGTJ-SfjLbOWNXwh6xXQDuUYFhZ5puH_1482142194"
}