curl --request POST \
  --url https://test-api.sandbox.co.in/bank/virtual/accounts/{account_number}/payments/payin/upi/collect \
  --header 'Content-Type: application/json' \
  --data '
{
  "@entity": "<string>",
  "payer": {
    "@entity": "<string>",
    "name": "<string>",
    "bank_account": {
      "@entity": "<string>",
      "upi_id": "<string>"
    }
  },
  "amount": 123,
  "payment_details": {
    "@entity": "<string>",
    "description": "<string>"
  }
}
'

import requests

url = "https://test-api.sandbox.co.in/bank/virtual/accounts/{account_number}/payments/payin/upi/collect"

payload = {
    "@entity": "<string>",
    "payer": {
        "@entity": "<string>",
        "name": "<string>",
        "bank_account": {
            "@entity": "<string>",
            "upi_id": "<string>"
        }
    },
    "amount": 123,
    "payment_details": {
        "@entity": "<string>",
        "description": "<string>"
    }
}
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({
    '@entity': '<string>',
    payer: {
      '@entity': '<string>',
      name: '<string>',
      bank_account: {'@entity': '<string>', upi_id: '<string>'}
    },
    amount: 123,
    payment_details: {'@entity': '<string>', description: '<string>'}
  })
};

fetch('https://test-api.sandbox.co.in/bank/virtual/accounts/{account_number}/payments/payin/upi/collect', 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://test-api.sandbox.co.in/bank/virtual/accounts/{account_number}/payments/payin/upi/collect",
  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([
    '@entity' => '<string>',
    'payer' => [
        '@entity' => '<string>',
        'name' => '<string>',
        'bank_account' => [
                '@entity' => '<string>',
                'upi_id' => '<string>'
        ]
    ],
    'amount' => 123,
    'payment_details' => [
        '@entity' => '<string>',
        'description' => '<string>'
    ]
  ]),
  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://test-api.sandbox.co.in/bank/virtual/accounts/{account_number}/payments/payin/upi/collect"

	payload := strings.NewReader("{\n  \"@entity\": \"<string>\",\n  \"payer\": {\n    \"@entity\": \"<string>\",\n    \"name\": \"<string>\",\n    \"bank_account\": {\n      \"@entity\": \"<string>\",\n      \"upi_id\": \"<string>\"\n    }\n  },\n  \"amount\": 123,\n  \"payment_details\": {\n    \"@entity\": \"<string>\",\n    \"description\": \"<string>\"\n  }\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://test-api.sandbox.co.in/bank/virtual/accounts/{account_number}/payments/payin/upi/collect")
  .header("Content-Type", "application/json")
  .body("{\n  \"@entity\": \"<string>\",\n  \"payer\": {\n    \"@entity\": \"<string>\",\n    \"name\": \"<string>\",\n    \"bank_account\": {\n      \"@entity\": \"<string>\",\n      \"upi_id\": \"<string>\"\n    }\n  },\n  \"amount\": 123,\n  \"payment_details\": {\n    \"@entity\": \"<string>\",\n    \"description\": \"<string>\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://test-api.sandbox.co.in/bank/virtual/accounts/{account_number}/payments/payin/upi/collect")

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  \"@entity\": \"<string>\",\n  \"payer\": {\n    \"@entity\": \"<string>\",\n    \"name\": \"<string>\",\n    \"bank_account\": {\n      \"@entity\": \"<string>\",\n      \"upi_id\": \"<string>\"\n    }\n  },\n  \"amount\": 123,\n  \"payment_details\": {\n    \"@entity\": \"<string>\",\n    \"description\": \"<string>\"\n  }\n}"

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

{
  "timestamp": 123,
  "transaction_id": "<string>",
  "data": {
    "id": "<string>",
    "description": "<string>",
    "created_at": 123,
    "@entity": "<string>",
    "notes": {},
    "payer": {
      "@entity": "<string>",
      "name": "<string>",
      "bank_account": {
        "@entity": "<string>",
        "notes": {},
        "upi_id": "<string>"
      }
    },
    "payee": {
      "@entity": "<string>",
      "name": "<string>",
      "bank_account": {
        "@entity": "<string>",
        "account_number": "<string>",
        "ifsc": "<string>",
        "notes": {},
        "upi_id": "<string>"
      }
    },
    "status": "<string>",
    "mode": "<string>",
    "type": "<string>",
    "amount": 123,
    "fee": 123,
    "tax": 123
  },
  "code": 123
}