curl --request POST \
  --url https://api.16tms.com/api/v1/tournaments/{tournamentId}/registrations/by-external-id \
  --header 'Content-Type: application/json' \
  --header 'X-API-KEY: <api-key>' \
  --data '
{
  "applicationMessage": "<string>",
  "password": "<string>",
  "payment": {
    "transactionId": "<string>",
    "amount": 123,
    "currencyId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "paymentMethod": "<string>"
  }
}
'

import requests

url = "https://api.16tms.com/api/v1/tournaments/{tournamentId}/registrations/by-external-id"

payload = {
    "applicationMessage": "<string>",
    "password": "<string>",
    "payment": {
        "transactionId": "<string>",
        "amount": 123,
        "currencyId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "paymentMethod": "<string>"
    }
}
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({
    applicationMessage: '<string>',
    password: '<string>',
    payment: {
      transactionId: '<string>',
      amount: 123,
      currencyId: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
      paymentMethod: '<string>'
    }
  })
};

fetch('https://api.16tms.com/api/v1/tournaments/{tournamentId}/registrations/by-external-id', 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.16tms.com/api/v1/tournaments/{tournamentId}/registrations/by-external-id",
  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([
    'applicationMessage' => '<string>',
    'password' => '<string>',
    'payment' => [
        'transactionId' => '<string>',
        'amount' => 123,
        'currencyId' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
        'paymentMethod' => '<string>'
    ]
  ]),
  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.16tms.com/api/v1/tournaments/{tournamentId}/registrations/by-external-id"

	payload := strings.NewReader("{\n  \"applicationMessage\": \"<string>\",\n  \"password\": \"<string>\",\n  \"payment\": {\n    \"transactionId\": \"<string>\",\n    \"amount\": 123,\n    \"currencyId\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n    \"paymentMethod\": \"<string>\"\n  }\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.16tms.com/api/v1/tournaments/{tournamentId}/registrations/by-external-id")
  .header("X-API-KEY", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"applicationMessage\": \"<string>\",\n  \"password\": \"<string>\",\n  \"payment\": {\n    \"transactionId\": \"<string>\",\n    \"amount\": 123,\n    \"currencyId\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n    \"paymentMethod\": \"<string>\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.16tms.com/api/v1/tournaments/{tournamentId}/registrations/by-external-id")

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  \"applicationMessage\": \"<string>\",\n  \"password\": \"<string>\",\n  \"payment\": {\n    \"transactionId\": \"<string>\",\n    \"amount\": 123,\n    \"currencyId\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n    \"paymentMethod\": \"<string>\"\n  }\n}"

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

{
  "success": true,
  "message": "Registration successful",
  "data": {
    "registrationId": "d8c3e4de-117a-4f69-994c-68698db6f938",
    "tournamentId": "0fe60e24-f120-45a4-baab-6bdab592b6b7",
    "tournamentName": "Auto Test Tournament",
    "participantId": "0cc2b3d5-71ad-49dc-ab7d-f35ba6bc0d55",
    "participantType": 2,
    "participantName": "string",
    "status": 2,
    "entryFeePaid": 50,
    "paymentStatus": "PendingPayment"
  },
  "meta": {
    "traceId": "00-f125448ab05644fa80f36b22f1d71ac5-0124b07dc253ea94-00",
    "elapsedMs": 70.26,
    "serverTimestamp": "2026-02-12T11:21:26.4669586Z"
  }
}

{
  "success": false,
  "error": {
    "code": "BUSINESS_RULE_VIOLATION",
    "message": "Participant is not eligible"
  },
  "meta": {
    "traceId": "00-f125448ab05644fa80f36b22f1d71ac5-0124b07dc253ea94-00",
    "elapsedMs": 70.26,
    "serverTimestamp": "2026-02-12T11:21:26.4669586Z"
  }
}