curl --request POST \
  --url https://api.text.com/cdp/v1/get_customers_count \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "query": "john",
  "filters": [
    {
      "operator": "AND",
      "clauses": [
        {
          "field": "country",
          "operator": "is",
          "values": [
            "Poland"
          ]
        }
      ]
    }
  ]
}
'

import requests

url = "https://api.text.com/cdp/v1/get_customers_count"

payload = {
    "query": "john",
    "filters": [
        {
            "operator": "AND",
            "clauses": [
                {
                    "field": "country",
                    "operator": "is",
                    "values": ["Poland"]
                }
            ]
        }
    ]
}
headers = {
    "Authorization": "Basic <encoded-value>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Basic <encoded-value>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    query: 'john',
    filters: [
      {
        operator: 'AND',
        clauses: [{field: 'country', operator: 'is', values: ['Poland']}]
      }
    ]
  })
};

fetch('https://api.text.com/cdp/v1/get_customers_count', 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.text.com/cdp/v1/get_customers_count",
  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([
    'query' => 'john',
    'filters' => [
        [
                'operator' => 'AND',
                'clauses' => [
                                [
                                                                'field' => 'country',
                                                                'operator' => 'is',
                                                                'values' => [
                                                                                                                                'Poland'
                                                                ]
                                ]
                ]
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Basic <encoded-value>",
    "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.text.com/cdp/v1/get_customers_count"

	payload := strings.NewReader("{\n  \"query\": \"john\",\n  \"filters\": [\n    {\n      \"operator\": \"AND\",\n      \"clauses\": [\n        {\n          \"field\": \"country\",\n          \"operator\": \"is\",\n          \"values\": [\n            \"Poland\"\n          ]\n        }\n      ]\n    }\n  ]\n}")

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

	req.Header.Add("Authorization", "Basic <encoded-value>")
	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.text.com/cdp/v1/get_customers_count")
  .header("Authorization", "Basic <encoded-value>")
  .header("Content-Type", "application/json")
  .body("{\n  \"query\": \"john\",\n  \"filters\": [\n    {\n      \"operator\": \"AND\",\n      \"clauses\": [\n        {\n          \"field\": \"country\",\n          \"operator\": \"is\",\n          \"values\": [\n            \"Poland\"\n          ]\n        }\n      ]\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.text.com/cdp/v1/get_customers_count")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Basic <encoded-value>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"query\": \"john\",\n  \"filters\": [\n    {\n      \"operator\": \"AND\",\n      \"clauses\": [\n        {\n          \"field\": \"country\",\n          \"operator\": \"is\",\n          \"values\": [\n            \"Poland\"\n          ]\n        }\n      ]\n    }\n  ]\n}"

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

{
  "count": 1523
}