curl --request POST \
  --url https://api.voucher-staging.allride.io/partner/v1/email-templates:preview \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "purpose": "redemption-link-otp",
  "subject": {
    "de": "Ihr Code: {{otpCode}}",
    "en": "Your code: {{otpCode}}"
  },
  "htmlBody": {
    "de": "<!doctype html><html><body><p>Ihr Code: {{otpCode}}</p><p>Gültig für {{expiresInMinutes}} Minuten.</p></body></html>",
    "en": "<!doctype html><html><body><p>Your code: {{otpCode}}</p><p>Valid for {{expiresInMinutes}} minutes.</p></body></html>"
  }
}
'

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    purpose: 'redemption-link-otp',
    subject: {de: 'Ihr Code: {{otpCode}}', en: 'Your code: {{otpCode}}'},
    htmlBody: {
      de: '<!doctype html><html><body><p>Ihr Code: {{otpCode}}</p><p>Gültig für {{expiresInMinutes}} Minuten.</p></body></html>',
      en: '<!doctype html><html><body><p>Your code: {{otpCode}}</p><p>Valid for {{expiresInMinutes}} minutes.</p></body></html>'
    }
  })
};

fetch('https://api.voucher-staging.allride.io/partner/v1/email-templates:preview', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.voucher-staging.allride.io/partner/v1/email-templates:preview"

payload = {
    "purpose": "redemption-link-otp",
    "subject": {
        "de": "Ihr Code: {{otpCode}}",
        "en": "Your code: {{otpCode}}"
    },
    "htmlBody": {
        "de": "<!doctype html><html><body><p>Ihr Code: {{otpCode}}</p><p>Gültig für {{expiresInMinutes}} Minuten.</p></body></html>",
        "en": "<!doctype html><html><body><p>Your code: {{otpCode}}</p><p>Valid for {{expiresInMinutes}} minutes.</p></body></html>"
    }
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

HttpResponse<String> response = Unirest.post("https://api.voucher-staging.allride.io/partner/v1/email-templates:preview")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"purpose\": \"redemption-link-otp\",\n  \"subject\": {\n    \"de\": \"Ihr Code: {{otpCode}}\",\n    \"en\": \"Your code: {{otpCode}}\"\n  },\n  \"htmlBody\": {\n    \"de\": \"<!doctype html><html><body><p>Ihr Code: {{otpCode}}</p><p>Gültig für {{expiresInMinutes}} Minuten.</p></body></html>\",\n    \"en\": \"<!doctype html><html><body><p>Your code: {{otpCode}}</p><p>Valid for {{expiresInMinutes}} minutes.</p></body></html>\"\n  }\n}")
  .asString();

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.voucher-staging.allride.io/partner/v1/email-templates:preview"

	payload := strings.NewReader("{\n  \"purpose\": \"redemption-link-otp\",\n  \"subject\": {\n    \"de\": \"Ihr Code: {{otpCode}}\",\n    \"en\": \"Your code: {{otpCode}}\"\n  },\n  \"htmlBody\": {\n    \"de\": \"<!doctype html><html><body><p>Ihr Code: {{otpCode}}</p><p>Gültig für {{expiresInMinutes}} Minuten.</p></body></html>\",\n    \"en\": \"<!doctype html><html><body><p>Your code: {{otpCode}}</p><p>Valid for {{expiresInMinutes}} minutes.</p></body></html>\"\n  }\n}")

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

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

}

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.voucher-staging.allride.io/partner/v1/email-templates:preview",
  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([
    'purpose' => 'redemption-link-otp',
    'subject' => [
        'de' => 'Ihr Code: {{otpCode}}',
        'en' => 'Your code: {{otpCode}}'
    ],
    'htmlBody' => [
        'de' => '<!doctype html><html><body><p>Ihr Code: {{otpCode}}</p><p>Gültig für {{expiresInMinutes}} Minuten.</p></body></html>',
        'en' => '<!doctype html><html><body><p>Your code: {{otpCode}}</p><p>Valid for {{expiresInMinutes}} minutes.</p></body></html>'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

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

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}