import requests

url = 'https://app.minimo.it/api/transactionals'
headers = {'Authorization': 'Bearer {{BEARER_TOKEN}}', 'Content-Type': 'application/json'}
data = {
    'recipient': '{{recipient}}',
    'uid': '{{uid}}',
    'customFields': {
        '{{customKey1}}': '{{customValue1}}',
        '{{customKey2}}': '{{customValue2}}',
        '{{customKey3}}': '{{customValue3}}'
    }
}
response = requests.post(url, json=data, headers=headers)
print(response.json())

fetch('https://app.minimo.it/api/transactionals', {
    method: 'POST',
    headers: {
        'Authorization': 'Bearer {{BEARER_TOKEN}}',
        'Content-Type': 'application/json'
    },
    body: JSON.stringify({
        'recipient': '{{recipient}}',
        'uid': '{{uid}}',
        'customFields': {
            '{{customKey1}}': '{{customValue1}}',
            '{{customKey2}}': '{{customValue2}}',
            '{{customKey3}}': '{{customValue3}}'
        }
    })
}).then(response => response.json()).then(data => console.log(data));

curl --request POST \
  --url https://app.minimo.it/api/transactionals \
  --header 'Authorization: Bearer {{BEARER_TOKEN}}' \
  --header 'Content-Type: application/json' \
  --data '{
  "recipient": "{{recipient}}",
  "uid": "{{uid}}",
  "customFields": {
    "{{customKey1}}": "{{customValue1}}",
    "{{customKey2}}": "{{customValue2}}",
    "{{customKey3}}": "{{customValue3}}"
  }
 }'

<?php

$curl = curl_init();

curl_setopt_array($curl, array(
    CURLOPT_URL => 'https://app.minimo.it/api/transactionals',
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_ENCODING => '',
    CURLOPT_MAXREDIRS => 10,
    CURLOPT_TIMEOUT => 0,
    CURLOPT_FOLLOWLOCATION => true,
    CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
    CURLOPT_CUSTOMREQUEST => 'POST',
    CURLOPT_POSTFIELDS =>'{
        "recipient": "{{recipient}}",
        "uid": "{{uid}}",
        "customFields": {
            "{{customKey1}}": "{{customValue1}}",
            "{{customKey2}}": "{{customValue2}}",
            "{{customKey3}}": "{{customValue3}}"
        }
    }',
    CURLOPT_HTTPHEADER => array(
        'Authorization: Bearer {{BEARER_TOKEN}}',
        'Content-Type: application/json'
    ),
));

$response = curl_exec($curl);

curl_close($curl);
echo $response;

import java.net.HttpURLConnection;
import java.net.URL;
import java.io.OutputStream;
import java.io.InputStreamReader;
import java.io.BufferedReader;

public class Main {
    public static void main(String[] args) {
        try {
            URL url = new URL('https://app.minimo.it/api/transactionals');
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod('POST');
            conn.setRequestProperty('Authorization', 'Bearer {{BEARER_TOKEN}}');
            conn.setRequestProperty('Content-Type', 'application/json');
            conn.setDoOutput(true);
            String jsonInputString = '{"recipient": "{{recipient}}", "uid": "{{uid}}", "customFields": {"{{customKey1}}": "{{customValue1}}", "{{customKey2}}": "{{customValue2}}", "{{customKey3}}": "{{customValue3}}"}}';
            try(OutputStream os = conn.getOutputStream()) {
                byte[] input = jsonInputString.getBytes('utf-8');
                os.write(input, 0, input.length);
            }
            try(BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream(), 'utf-8'))) {
                StringBuilder response = new StringBuilder();
                String responseLine = null;
                while ((responseLine = br.readLine()) != null) {
                    response.append(responseLine.trim());
                }
                System.out.println(response.toString());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

package main

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

func main() {

	url := "https://app.minimo.it/api/transactionals"

	payload := strings.NewReader("{\n  \"recipient\": \"email@minimo.it\",\n  \"uid\": \"ABCDE143\",\n  \"customFields\": {\n    \"customKey1\": \"customValue1\",\n    \"customKey2\": \"customValue2\",\n    \"customKey3\": \"customValue3\"\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))

}

require 'uri'
require 'net/http'

url = URI("https://app.minimo.it/api/transactionals")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"recipient\": \"email@minimo.it\",\n  \"uid\": \"ABCDE143\",\n  \"customFields\": {\n    \"customKey1\": \"customValue1\",\n    \"customKey2\": \"customValue2\",\n    \"customKey3\": \"customValue3\"\n  }\n}"

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

{
  "status": 123
}

{
  "error": "<string>"
}

{
  "error": "<string>"
}