curl --request POST \
  --url https://qubesync.com/api/v1/connections/{connection_id}/data_ext_mods \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "owner_id": "0",
  "data_ext_name": "Loyalty Tier",
  "data_ext_value": "Gold",
  "list_data_ext_type": "Customer",
  "list_id": "80000001-1234567890"
}
'

import requests

url = "https://qubesync.com/api/v1/connections/{connection_id}/data_ext_mods"

payload = {
    "owner_id": "0",
    "data_ext_name": "Loyalty Tier",
    "data_ext_value": "Gold",
    "list_data_ext_type": "Customer",
    "list_id": "80000001-1234567890"
}
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({
    owner_id: '0',
    data_ext_name: 'Loyalty Tier',
    data_ext_value: 'Gold',
    list_data_ext_type: 'Customer',
    list_id: '80000001-1234567890'
  })
};

fetch('https://qubesync.com/api/v1/connections/{connection_id}/data_ext_mods', 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://qubesync.com/api/v1/connections/{connection_id}/data_ext_mods",
  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([
    'owner_id' => '0',
    'data_ext_name' => 'Loyalty Tier',
    'data_ext_value' => 'Gold',
    'list_data_ext_type' => 'Customer',
    'list_id' => '80000001-1234567890'
  ]),
  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://qubesync.com/api/v1/connections/{connection_id}/data_ext_mods"

	payload := strings.NewReader("{\n  \"owner_id\": \"0\",\n  \"data_ext_name\": \"Loyalty Tier\",\n  \"data_ext_value\": \"Gold\",\n  \"list_data_ext_type\": \"Customer\",\n  \"list_id\": \"80000001-1234567890\"\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://qubesync.com/api/v1/connections/{connection_id}/data_ext_mods")
  .header("Authorization", "Basic <encoded-value>")
  .header("Content-Type", "application/json")
  .body("{\n  \"owner_id\": \"0\",\n  \"data_ext_name\": \"Loyalty Tier\",\n  \"data_ext_value\": \"Gold\",\n  \"list_data_ext_type\": \"Customer\",\n  \"list_id\": \"80000001-1234567890\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://qubesync.com/api/v1/connections/{connection_id}/data_ext_mods")

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  \"owner_id\": \"0\",\n  \"data_ext_name\": \"Loyalty Tier\",\n  \"data_ext_value\": \"Gold\",\n  \"list_data_ext_type\": \"Customer\",\n  \"list_id\": \"80000001-1234567890\"\n}"

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

{
  "data": {
    "id": "550e8400-e29b-41d4-a716-446655440000",
    "state": "waiting",
    "request_xml": "<QBXML><QBXMLMsgsRq onError='stopOnError'><CustomerQueryRq requestID='1'><MaxReturned>100</MaxReturned></CustomerQueryRq></QBXMLMsgsRq></QBXML>",
    "connection_id": "123e4567-e89b-12d3-a456-426614174000",
    "webhook_state": "not_applicable",
    "request_json": {
      "version": "13.0",
      "request": {
        "name": "CustomerQueryRq",
        "attributes": {
          "requestID": "1"
        },
        "children": [
          {
            "name": "MaxReturned",
            "text": "100"
          }
        ]
      }
    },
    "response_xml": "<QBXML><QBXMLMsgsRs statusCode='0' statusSeverity='Info' statusMessage='Status OK'><CustomerQueryRs requestID='1' statusCode='0' statusSeverity='Info' statusMessage='Status OK'><CustomerRet><ListID>80000001-1234567890</ListID><Name>Sample Customer</Name></CustomerRet></CustomerQueryRs></QBXMLMsgsRs></QBXML>",
    "response_json": [
      {}
    ],
    "webhook_url": "https://example.com/webhook",
    "webhook_attempts": [
      {
        "attempted_at": "2023-11-07T05:31:56Z",
        "response": "<string>"
      }
    ],
    "webhook_error": "<string>",
    "error": {
      "message": "<string>",
      "code": "<string>",
      "details": {}
    },
    "links": {
      "self": "/api/v1/connections/123e4567-e89b-12d3-a456-426614174000/queued_requests/550e8400-e29b-41d4-a716-446655440000",
      "ui": "/app/queued_requests/550e8400-e29b-41d4-a716-446655440000",
      "connection_ui": "/app/connections/123e4567-e89b-12d3-a456-426614174000"
    },
    "inserted_at": "2023-01-01T12:00:00Z",
    "updated_at": "2023-01-01T12:00:01Z"
  }
}

{
  "error": {
    "code": "invalid_request",
    "message": "The request was invalid"
  }
}

{
  "error": {
    "code": "unauthorized",
    "message": "Authentication required"
  }
}

{
  "error": {
    "code": "not_found",
    "message": "The requested resource was not found"
  }
}