curl --request POST \
  --url https://uat-interface.haipay.asia/ngn/collect/apply \
  --header 'Content-Type: application/json' \
  --data '
{
  "appId": 1054,
  "orderId": "NGNCOLLECT001",
  "amount": "25000.00",
  "email": "emeka.okafor@gmail.com",
  "callBackUrl": "https://shop.merchant.com/payment/success",
  "notifyUrl": "https://api.merchant.com/webhooks/haipay",
  "sign": "signature"
}
'

import requests

url = "https://uat-interface.haipay.asia/ngn/collect/apply"

payload = {
    "appId": 1054,
    "orderId": "NGNCOLLECT001",
    "amount": "25000.00",
    "email": "emeka.okafor@gmail.com",
    "callBackUrl": "https://shop.merchant.com/payment/success",
    "notifyUrl": "https://api.merchant.com/webhooks/haipay",
    "sign": "signature"
}
headers = {"Content-Type": "application/json"}

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

print(response.text)

const url = 'https://uat-interface.haipay.asia/ngn/collect/apply';
const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    appId: 1054,
    orderId: 'NGNCOLLECT001',
    amount: '25000.00',
    email: 'emeka.okafor@gmail.com',
    callBackUrl: 'https://shop.merchant.com/payment/success',
    notifyUrl: 'https://api.merchant.com/webhooks/haipay',
    sign: 'signature'
  })
};

fetch(url, options)
  .then(res => res.json())
  .then(json => console.log(json))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://uat-interface.haipay.asia/ngn/collect/apply",
  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([
    'appId' => 1054,
    'orderId' => 'NGNCOLLECT001',
    'amount' => '25000.00',
    'email' => 'emeka.okafor@gmail.com',
    'callBackUrl' => 'https://shop.merchant.com/payment/success',
    'notifyUrl' => 'https://api.merchant.com/webhooks/haipay',
    'sign' => 'signature'
  ]),
  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;
}

HttpResponse<String> response = Unirest.post("https://uat-interface.haipay.asia/ngn/collect/apply")
  .header("Content-Type", "application/json")
  .body("{\n  \"appId\": 1054,\n  \"orderId\": \"NGNCOLLECT001\",\n  \"amount\": \"25000.00\",\n  \"email\": \"emeka.okafor@gmail.com\",\n  \"callBackUrl\": \"https://shop.merchant.com/payment/success\",\n  \"notifyUrl\": \"https://api.merchant.com/webhooks/haipay\",\n  \"sign\": \"signature\"\n}")
  .asString();