Create Invoice

<?php
$post = [
    'public_key'   => 'YOUR_PUBLIC_KEY',
    'private_key'  => 'YOUR_PRIVATE_KEY',
    'price_amount' => 100,
    'price_currency' => 'USD',
    'order_id'     => 42,
    'email'        => '[email protected]',
    'callback_url' => 'https://yoursite.com/payment/callback',
    'success_url'  => 'https://yoursite.com/payment/success',
    'cancel_url'   => 'https://yoursite.com/payment/cancel',
    // 'test' => 1,                // test invoice: completes automatically
    // 'banned_coins' => json_encode(["BTC","ETH"]),
];

$ch = curl_init('https://payid19.com/api/v1/create_invoice');
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($post));
$result = curl_exec($ch);
curl_close($ch);

$response = json_decode($result);
if ($response->status == 'error') {
    echo $response->message[0];          // handle the error
} else {
    header('Location: ' . $response->message);  // redirect to the payment page
}

const axios = require('axios');

const postData = {
    public_key:   'YOUR_PUBLIC_KEY',
    private_key:  'YOUR_PRIVATE_KEY',
    price_amount: 100,
    price_currency: 'USD',
    order_id:     42,
    email:        '[email protected]',
    callback_url: 'https://yoursite.com/payment/callback',
    success_url:  'https://yoursite.com/payment/success',
    cancel_url:   'https://yoursite.com/payment/cancel',
};

axios.post('https://payid19.com/api/v1/create_invoice', postData)
    .then(({ data }) => {
        if (data.status === 'error') {
            console.error(data.message[0]);   // handle the error
        } else {
            console.log(data.message);        // the payment page URL
        }
    })
    .catch(err => console.error(err.message));

import requests

post_data = {
    'public_key':   'YOUR_PUBLIC_KEY',
    'private_key':  'YOUR_PRIVATE_KEY',
    'price_amount': 100,
    'price_currency': 'USD',
    'order_id':     42,
    'email':        '[email protected]',
    'callback_url': 'https://yoursite.com/payment/callback',
    'success_url':  'https://yoursite.com/payment/success',
    'cancel_url':   'https://yoursite.com/payment/cancel',
}

response = requests.post('https://payid19.com/api/v1/create_invoice', data=post_data)
result = response.json()

if result['status'] == 'error':
    print(result['message'][0])   # handle the error
else:
    print(result['message'])      # the payment page URL

const express = require('express');
const app = express();
app.use(express.json());

app.post('/payment/callback', (req, res) => {
    if (req.body.privatekey !== 'YOUR_PRIVATE_KEY') {   // verify the sender
        return res.status(403).send('Forbidden');
    }
    // payment confirmed - mark order req.body.order_id as paid
    res.sendStatus(200);
});

app.listen(3000);

from flask import Flask, request

app = Flask(__name__)

@app.route('/payment/callback', methods=['POST'])
def payment_callback():
    data = request.get_json()
    if data.get('privatekey') != 'YOUR_PRIVATE_KEY':   # verify the sender
        return 'Forbidden', 403
    # payment confirmed - mark order data['order_id'] as paid
    return 'OK', 200

app.run(port=5000)