curl --request POST \
  --url https://uat-interface.haipay.asia/sgd/collect/apply \
  --header 'Content-Type: application/json' \
  --data '
{
  "appId": 1054,
  "orderId": "M233323000059",
  "name": "Tan Wei Ming",
  "phone": "91234567",
  "email": "tan.weiming@gmail.com",
  "amount": "250.00",
  "payType": "ONLINE_BANKING",
  "inBankCode": "PAYNOW",
  "callBackUrl": "https://merchant.com/payment/success",
  "callBackFailUrl": "https://merchant.com/payment/fail",
  "notifyUrl": "https://merchant.com/api/notify",
  "subject": "Payment for order",
  "body": "Premium subscription",
  "partnerUserId": "149597870",
  "sign": "af0gAHkUOyYHu9owQp8NJ4mPEeUW4vuJcjdxqLIzrVw8AvpLSjD1DXupReSG/CyuSkFRyiIvCp5u703AuGGmfgD2gKDH3Ywau41bAbG2jnHJ8mtjiSJ5iWUzanyd4Kr7d1+rETbzUl7/BkW3t0X8UUFdqpxwG8DPUjAwUKfplWDHV7koG51Ozexd80DCsmW6eWdouAZ1uNXGLYmV3ftE3BmfNRtuv1C5bfTJWrTEIOxbF6g2uYOFZTlIgrQgd7/2PsAYwQQXNz8Q8CYl4OxqCv4pXJxaLWPbR5tqZu9og5kn32C9aHW/NlU1y39vzz+4ef81yPAqUV9oHlSMSPrMmw=="
}
'

import requests

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

payload = {
    "appId": 1054,
    "orderId": "M233323000059",
    "name": "Tan Wei Ming",
    "phone": "91234567",
    "email": "tan.weiming@gmail.com",
    "amount": "250.00",
    "payType": "ONLINE_BANKING",
    "inBankCode": "PAYNOW",
    "callBackUrl": "https://merchant.com/payment/success",
    "callBackFailUrl": "https://merchant.com/payment/fail",
    "notifyUrl": "https://merchant.com/api/notify",
    "subject": "Payment for order",
    "body": "Premium subscription",
    "partnerUserId": "149597870",
    "sign": "af0gAHkUOyYHu9owQp8NJ4mPEeUW4vuJcjdxqLIzrVw8AvpLSjD1DXupReSG/CyuSkFRyiIvCp5u703AuGGmfgD2gKDH3Ywau41bAbG2jnHJ8mtjiSJ5iWUzanyd4Kr7d1+rETbzUl7/BkW3t0X8UUFdqpxwG8DPUjAwUKfplWDHV7koG51Ozexd80DCsmW6eWdouAZ1uNXGLYmV3ftE3BmfNRtuv1C5bfTJWrTEIOxbF6g2uYOFZTlIgrQgd7/2PsAYwQQXNz8Q8CYl4OxqCv4pXJxaLWPbR5tqZu9og5kn32C9aHW/NlU1y39vzz+4ef81yPAqUV9oHlSMSPrMmw=="
}
headers = {"Content-Type": "application/json"}

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

print(response.text)

const url = 'https://uat-interface.haipay.asia/sgd/collect/apply';
const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    appId: 1054,
    orderId: 'M233323000059',
    name: 'Tan Wei Ming',
    phone: '91234567',
    email: 'tan.weiming@gmail.com',
    amount: '250.00',
    payType: 'ONLINE_BANKING',
    inBankCode: 'PAYNOW',
    callBackUrl: 'https://merchant.com/payment/success',
    callBackFailUrl: 'https://merchant.com/payment/fail',
    notifyUrl: 'https://merchant.com/api/notify',
    subject: 'Payment for order',
    body: JSON.stringify('Premium subscription'),
    partnerUserId: '149597870',
    sign: 'af0gAHkUOyYHu9owQp8NJ4mPEeUW4vuJcjdxqLIzrVw8AvpLSjD1DXupReSG/CyuSkFRyiIvCp5u703AuGGmfgD2gKDH3Ywau41bAbG2jnHJ8mtjiSJ5iWUzanyd4Kr7d1+rETbzUl7/BkW3t0X8UUFdqpxwG8DPUjAwUKfplWDHV7koG51Ozexd80DCsmW6eWdouAZ1uNXGLYmV3ftE3BmfNRtuv1C5bfTJWrTEIOxbF6g2uYOFZTlIgrQgd7/2PsAYwQQXNz8Q8CYl4OxqCv4pXJxaLWPbR5tqZu9og5kn32C9aHW/NlU1y39vzz+4ef81yPAqUV9oHlSMSPrMmw=='
  })
};

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/sgd/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' => 'M233323000059',
    'name' => 'Tan Wei Ming',
    'phone' => '91234567',
    'email' => 'tan.weiming@gmail.com',
    'amount' => '250.00',
    'payType' => 'ONLINE_BANKING',
    'inBankCode' => 'PAYNOW',
    'callBackUrl' => 'https://merchant.com/payment/success',
    'callBackFailUrl' => 'https://merchant.com/payment/fail',
    'notifyUrl' => 'https://merchant.com/api/notify',
    'subject' => 'Payment for order',
    'body' => 'Premium subscription',
    'partnerUserId' => '149597870',
    'sign' => 'af0gAHkUOyYHu9owQp8NJ4mPEeUW4vuJcjdxqLIzrVw8AvpLSjD1DXupReSG/CyuSkFRyiIvCp5u703AuGGmfgD2gKDH3Ywau41bAbG2jnHJ8mtjiSJ5iWUzanyd4Kr7d1+rETbzUl7/BkW3t0X8UUFdqpxwG8DPUjAwUKfplWDHV7koG51Ozexd80DCsmW6eWdouAZ1uNXGLYmV3ftE3BmfNRtuv1C5bfTJWrTEIOxbF6g2uYOFZTlIgrQgd7/2PsAYwQQXNz8Q8CYl4OxqCv4pXJxaLWPbR5tqZu9og5kn32C9aHW/NlU1y39vzz+4ef81yPAqUV9oHlSMSPrMmw=='
  ]),
  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/sgd/collect/apply")
  .header("Content-Type", "application/json")
  .body("{\n  \"appId\": 1054,\n  \"orderId\": \"M233323000059\",\n  \"name\": \"Tan Wei Ming\",\n  \"phone\": \"91234567\",\n  \"email\": \"tan.weiming@gmail.com\",\n  \"amount\": \"250.00\",\n  \"payType\": \"ONLINE_BANKING\",\n  \"inBankCode\": \"PAYNOW\",\n  \"callBackUrl\": \"https://merchant.com/payment/success\",\n  \"callBackFailUrl\": \"https://merchant.com/payment/fail\",\n  \"notifyUrl\": \"https://merchant.com/api/notify\",\n  \"subject\": \"Payment for order\",\n  \"body\": \"Premium subscription\",\n  \"partnerUserId\": \"149597870\",\n  \"sign\": \"af0gAHkUOyYHu9owQp8NJ4mPEeUW4vuJcjdxqLIzrVw8AvpLSjD1DXupReSG/CyuSkFRyiIvCp5u703AuGGmfgD2gKDH3Ywau41bAbG2jnHJ8mtjiSJ5iWUzanyd4Kr7d1+rETbzUl7/BkW3t0X8UUFdqpxwG8DPUjAwUKfplWDHV7koG51Ozexd80DCsmW6eWdouAZ1uNXGLYmV3ftE3BmfNRtuv1C5bfTJWrTEIOxbF6g2uYOFZTlIgrQgd7/2PsAYwQQXNz8Q8CYl4OxqCv4pXJxaLWPbR5tqZu9og5kn32C9aHW/NlU1y39vzz+4ef81yPAqUV9oHlSMSPrMmw==\"\n}")
  .asString();