curl --request POST \
  --url https://api.greentick.ai/v1/contacts \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "phoneNumber": "+91 98765 43210",
  "firstName": "<string>",
  "lastName": "<string>",
  "notes": "<string>",
  "attributes": [
    {
      "id": "<string>",
      "value": "<string>"
    }
  ],
  "labels": [
    "668f1a2b3c4d5e6f7a8b9c10"
  ]
}
'

import requests

url = "https://api.greentick.ai/v1/contacts"

payload = {
    "phoneNumber": "+91 98765 43210",
    "firstName": "<string>",
    "lastName": "<string>",
    "notes": "<string>",
    "attributes": [
        {
            "id": "<string>",
            "value": "<string>"
        }
    ],
    "labels": ["668f1a2b3c4d5e6f7a8b9c10"]
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    phoneNumber: '+91 98765 43210',
    firstName: '<string>',
    lastName: '<string>',
    notes: '<string>',
    attributes: [{id: '<string>', value: '<string>'}],
    labels: ['668f1a2b3c4d5e6f7a8b9c10']
  })
};

fetch('https://api.greentick.ai/v1/contacts', 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.greentick.ai/v1/contacts",
  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' => '+91 98765 43210',
    'firstName' => '<string>',
    'lastName' => '<string>',
    'notes' => '<string>',
    'attributes' => [
        [
                'id' => '<string>',
                'value' => '<string>'
        ]
    ],
    'labels' => [
        '668f1a2b3c4d5e6f7a8b9c10'
    ]
  ]),
  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;
}

package main

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

func main() {

	url := "https://api.greentick.ai/v1/contacts"

	payload := strings.NewReader("{\n  \"phoneNumber\": \"+91 98765 43210\",\n  \"firstName\": \"<string>\",\n  \"lastName\": \"<string>\",\n  \"notes\": \"<string>\",\n  \"attributes\": [\n    {\n      \"id\": \"<string>\",\n      \"value\": \"<string>\"\n    }\n  ],\n  \"labels\": [\n    \"668f1a2b3c4d5e6f7a8b9c10\"\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))

}

HttpResponse<String> response = Unirest.post("https://api.greentick.ai/v1/contacts")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"phoneNumber\": \"+91 98765 43210\",\n  \"firstName\": \"<string>\",\n  \"lastName\": \"<string>\",\n  \"notes\": \"<string>\",\n  \"attributes\": [\n    {\n      \"id\": \"<string>\",\n      \"value\": \"<string>\"\n    }\n  ],\n  \"labels\": [\n    \"668f1a2b3c4d5e6f7a8b9c10\"\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.greentick.ai/v1/contacts")

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  \"phoneNumber\": \"+91 98765 43210\",\n  \"firstName\": \"<string>\",\n  \"lastName\": \"<string>\",\n  \"notes\": \"<string>\",\n  \"attributes\": [\n    {\n      \"id\": \"<string>\",\n      \"value\": \"<string>\"\n    }\n  ],\n  \"labels\": [\n    \"668f1a2b3c4d5e6f7a8b9c10\"\n  ]\n}"

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

{
  "success": false,
  "code": "INVALID_TO",
  "message": "to (E.164 phone) is required"
}

{
  "success": false,
  "code": "INVALID_TO",
  "message": "to (E.164 phone) is required"
}