curl --request POST \
  --url https://vpos-sandbox.payven.com.tr/api/v1/checkout/sessions/{session_id}/complete \
  --header 'Content-Type: application/json' \
  --data '
{
  "transaction_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}
'

import requests

url = "https://vpos-sandbox.payven.com.tr/api/v1/checkout/sessions/{session_id}/complete"

payload = { "transaction_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a" }
headers = {"Content-Type": "application/json"}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({transaction_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a'})
};

fetch('https://vpos-sandbox.payven.com.tr/api/v1/checkout/sessions/{session_id}/complete', 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://vpos-sandbox.payven.com.tr/api/v1/checkout/sessions/{session_id}/complete",
  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([
    'transaction_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a'
  ]),
  CURLOPT_HTTPHEADER => [
    "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://vpos-sandbox.payven.com.tr/api/v1/checkout/sessions/{session_id}/complete"

	payload := strings.NewReader("{\n  \"transaction_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n}")

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

	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://vpos-sandbox.payven.com.tr/api/v1/checkout/sessions/{session_id}/complete")
  .header("Content-Type", "application/json")
  .body("{\n  \"transaction_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://vpos-sandbox.payven.com.tr/api/v1/checkout/sessions/{session_id}/complete")

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

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"transaction_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n}"

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

{
  "type": "https://docs.payven.com.tr/errors/bad_request",
  "title": "Geçersiz istek",
  "status": 400,
  "code": "bad_request",
  "detail": "amount.amount alanı zorunlu.",
  "correlation_id": "9f1c8e76-2a3b-4f12-9c8d-12cb24a8a8a8"
}

{
  "type": "https://docs.payven.com.tr/errors/invalid_token",
  "title": "Geçersiz token",
  "status": 401,
  "code": "invalid_token",
  "detail": "Access token geçersiz veya süresi dolmuş — refresh edin."
}

{
  "type": "https://docs.payven.com.tr/errors/forbidden",
  "title": "Yetki yok",
  "status": 403,
  "code": "forbidden",
  "detail": "Bu rol bu kaynağı göremez."
}

{
  "type": "<string>",
  "title": "<string>",
  "status": 123,
  "detail": "<string>",
  "instance": "<string>"
}

{
  "type": "https://docs.payven.com.tr/errors/idempotency_key_in_use",
  "title": "Idempotency-Key çakışması",
  "status": 409,
  "code": "idempotency_key_in_use",
  "detail": "Bu Idempotency-Key daha önce farklı bir istek gövdesi ile kullanıldı."
}

{
  "type": "https://docs.payven.com.tr/errors/bank_declined",
  "title": "Banka işlemi reddetti",
  "status": 422,
  "code": "bank_declined",
  "detail": "Yetersiz bakiye (banka kodu: 51)",
  "provider_error_code": "51"
}

{
  "type": "https://docs.payven.com.tr/errors/rate_limit_exceeded",
  "title": "İstek limiti aşıldı",
  "status": 429,
  "code": "rate_limit_exceeded"
}

{
  "type": "https://docs.payven.com.tr/errors/internal_server_error",
  "title": "Sunucu hatası",
  "status": 500,
  "code": "internal_server_error"
}

{
  "type": "https://docs.payven.com.tr/errors/connector_unavailable",
  "title": "Konnektör erişilemez",
  "status": 503,
  "code": "connector_unavailable"
}