crypto-pay-api

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Cryptocurrency payment system based on @CryptoBot

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# @foile/crypto-pay-api

**[Crypto Pay](http://t.me/CryptoBot/?start=pay)** is a payment system based on [@CryptoBot](http://t.me/CryptoBot), which allows you to accept payments in cryptocurrency using the API.

This library help you to work with **Crypto Pay** via [Crypto Pay API](https://telegra.ph/Crypto-Pay-API-11-25).

## Install

```sh
npm i @foile/crypto-pay-api
```

## Usage

### API

First, you need to create your application and get an API token. Open [@CryptoBot](http://t.me/CryptoBot?start=pay) or [@CryptoTestnetBot](http://t.me/CryptoTestnetBot?start=pay) (for testnet), send a command `/pay` to create a new app and get API Token.

Next step: try to call a simple `getMe()` method to check that everything is working welll:

```js
const { CryptoPay } = require('@foile/crypto-pay-api');
  
const cryptoPay = new CryptoPay(token);
const app = await cryptoPay.getMe();
console.log(app);
```

You can setup net `hostname` (defaults to `pay.crypt.bot`) and `protocol` in optional param:

```js
const cryptoPay = new CryptoPay(token, {
  hostname: 'testnet-pay.crypt.bot',
  protocol: 'https'
});
```

Net     | Bot                                                         | Hostname
------- | ----------------------------------------------------------- |------------------------
mainnet | [@CryptoBot](http://t.me/CryptoBot?start=pay)               | `pay.crypt.bot`
testnet | [@CryptoTestnetBot](http://t.me/CryptoTestnetBot?start=pay) | `testnet-pay.crypt.bot`

> All queries to the Crypto Pay API must be sent over **HTTPS**

You can find all available methods in [next chapter](#Methods).

Also, you can get supported [assets](#Assets) and [paid button names](#Paid-Button-Names):

```js
const { CryptoPay, Assets, PaidButtonNames } = require('@foile/crypto-pay-api');

const cryptoPay = new CryptoPay(token);
cryptoPay.createInvoice(Assets.BTC, 1, {
  description: 'kitten',
  paid_btn_name: PaidButtonNames.VIEW_ITEM,
  paid_btn_url: 'http://placekitten.com/150',
});
```

Look full code in the [examples directory](https://github.com/Foile/crypto-pay-api/tree/main/examples).

### Webhooks

Use Webhooks to get updates for the app.

If you'd like to make sure that the Webhook request comes from Crypto Pay, we recommend using a secret path in the URL, e.g. `https://www.example.com/<secret>`.

> Webhooks will send may at least one time

```js
const cryptoPay = new CryptoPay(token, {
  webhook: {
    serverHostname: 'localhost',
    serverPort: 4200,
    path: '/secret-path'
  },
});

cryptoPay.on('invoice_paid', update => console.log(update.payload));
```

You can use pretty simple alias methods named from update names:

```js
cryptoPay.invoicePaid(update => console.log(update.payload));
```

See all available updates [here](#Update-Types).

## Methods

**API**

* [getMe](#getMe)
* [createInvoice](#createInvoice)
* [transfer](#transfer)
* [getInvoices](#getInvoices)
* [getBalance](#getBalance)
* [getExchangeRates](#getExchangeRates)
* [getCurrencies](#getCurrencies)

**Updates**

* [on](#on)
  * [invoicePaid](#invoicePaid)
* [once](#once)
* [off](#off)

### getMe

A simple method for testing your app's authentication token. Requires no parameters. Returns basic information about the app.

```js
cryptoPay.getMe();
```

### createInvoice

Use this method to create a new invoice. Returns object of created invoice.

* **asset** (string)
Currency code. Supported assets: `BTC`, `TON`, `ETH`, `USDT`, `USDC` and `BUSD`.
* **amount** (string)
Amount of the invoice in float. For example: `125.50`
* **description** (string)
*Optional*. Description for the invoice. User will see this description when they pay the invoice. Up to 1024 characters.
* **hidden_message** (string)
*Optional*. Text of the message that will be shown to a user after the invoice is paid. Up to 2048 characters.
* **paid_btn_name** (string) default - `callback`
*Optional*. Name of the button that will be shown to a user after the invoice is paid. Supported names:

* `viewItem` - View Item
  * `openChannel` - View Channel
  * `openBot` - Open Bot
  * `callback` - Return

* **paid_btn_url** (string)
*Optional* Required if paid_btn_name is used. URL to be opened when the button is pressed. You can set any success link (for example, a link to your bot). Starts with https or http.
* **payload** (string)
*Optional*. Any data you want to attach to the invoice (for example, user ID, payment ID, ect). Up to 4kb.
* **allow_comments** (boolean)
*Optional*. Allow a user to add a comment to the payment. Default is true.
* **allow_anonymous** (boolean)
*Optional*. Allow a user to pay the invoice anonymously. Default is true.
* **expires_in** (number)
*Optional*. You can set a payment time limit for the invoice in seconds. Values between 1-2678400 are accepted.

```js
cryptoPay.createInvoice(Assets.BTC, 1, {
  description: 'kitten',
  paid_btn_name: PaidButtonNames.VIEW_ITEM,
  paid_btn_url: 'http://placekitten.com/150',
});
```

### transfer

Use this method to send coins from your app to the user. Returns object of completed transfer.

* **user_id** (number)
Telegram User ID. The user needs to have an account in our bot (send /start if no).
* **asset** (string)
Currency code. Supported assets: `BTC`, `TON`, `ETH`, `USDT`, `USDC` and `BUSD`.
* **amount** (string)
Amount of the transfer in float. The minimum and maximum amounts for each of the support asset roughly correspond to the limit of 1-25000 USD. Use [getExchangeRates](#getExchangeRates) to convert amounts. For example: `125.50`
* **spend_id** (string)
Unique ID to make your request idempotent and ensure that only one of the transfers with the same spend_id is accepted from your app. This parameter is useful when the transfer should be retried (i.e. request timeout, connection reset, 500 HTTP status, etc). Up to 64 symbols.
* **comment** (string)
*Optional*. Comment for the transfer. Users will see this comment when they receive a notification about the transfer. Up to 1024 symbols.
* **disable_send_notification** (boolean)
*Optional*. Pass true if the user should not receive a notification about the transfer. Default is false.

```js
cryptoPay.transfer(121011054, Assets.ETH, 0.1, 'ZG9uYXRl', { comment: 'donate' });
```

### getInvoices

Use this method to get invoices of your app. On success, the returns array of invoices.

* **asset** (string)
*Optional*. Currency codes separated by comma. Supported assets: `BTC`, `TON`, `ETH`, `USDT`, `USDC` and `BUSD`. Defaults to all assets.
* **invoice_ids** (string)
*Optional*. Invoice IDs separated by comma.
* **status** (string)
*Optional*. Status of invoices to be returned. Available statuses: `active` and `paid`. Defaults to all statuses.
* **offset** (number)
*Optional*. Offset needed to return a specific subset of invoices. Default is 0.
* **count** (number)
*Optional*. Number of invoices to be returned. Values between 1-1000 are accepted. Default is 100.

```js
cryptoPay.getInvoices({ asset: Assets.BTC, count: 10 });
```

### getBalance

Use this method to get balance of your app. Returns array of assets.

```js
cryptoPay.getBalance();
```

### getExchangeRates

Use this method to get exchange rates of supported currencies. Returns array of currencies.

```js
cryptoPay.getExchangeRates();
```

### getCurrencies

Use this method to supported currencies. Returns array of currencies.

```js
cryptoPay.getCurrencies();
```

### on

Adds handler to the choosen [update type](#Update-Types).

```js
cryptoPay.on('invoice_paid', update => console.log(update.payload));
```

### invoicePaid

Adds handler to `invoice_paid` update.

```js
cryptoPay.invoicePaid(update => console.log(update.payload));
```

### once

Adds a one-time handler to the choosen [update type](#Update-Types).

```js
cryptoPay.once('invoice_paid', update => console.log(update.payload));
```

### off

Removes the specified listener from the listener array for the event named eventName.

```js
const subscriber = (update) => console.log(update.payload)

cryptoPay.on('invoice_paid', subscriber);

setTimeout(
  () => cryptoPay.off('invoice_paid', subscriber),
  10000
);
```

## Update Types

* [invoice_paid](#getMe)

## Constants

### Assets

constant      | value
------------- | ------
`Assets.BTC`  | `BTC`
`Assets.TON`  | `TON`
`Assets.ETH`  | `ETH`
`Assets.USDT` | `USDT`
`Assets.USDC` | `USDC`
`Assets.BUSD` | `BUSD`

### Paid Button Names

constant                       | value
------------------------------ | -------------
`PaidButtonNames.VIEW_ITEM`    | `viewItem`
`PaidButtonNames.OPEN_CHANNEL` | `openChannel`
`PaidButtonNames.OPEN_BOT`     | `openBot`
`PaidButtonNames.CALLBACK`     | `callback`

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