MWC Pay Node.js SDK

Description

Node.js SDK for MWC Pay.

Installing

Run the following command from the root of your project to install this library and configure your project to use it.

npm install @nicolasflamel/mwc-pay

Usage

After an MwcPay object has been created, it can be used to create payments, query the status of payments, get the current price of MimbleWimble coin, and get info about MWC Pay's public server.

A high level overview of a payment's life cycle when using this SDK consists of the following steps:

1. The merchant creates a payment and gets the payment's URL from the response.
2. The buyer sends MimbleWimble Coin to that URL.
3. The merchant can optionally monitor the payment's status via the getPaymentInfo method, the createPayment method's received_callback parameter, the createPayment method's confirmed_callback parameter, and/or the createPayment method's expired_callback parameter.
4. The payment's completed callback is ran once the payment achieves the desired number of on-chain confirmations.

The following code briefly shows how to use this SDK. A more complete example with error checking is available here.

// Require dependencies
const MwcPay = require("@nicolasflamel/mwc-pay");

// Initialize MWC Pay
const mwcPay = new MwcPay("http://localhost:9010");

// Create payment
const payment = await mwcPay.createPayment("123.456", 5, 600, "http://example.com/completed", "http://example.com/received", "http://example.com/confirmed", "http://example.com/expired");

// Get payment info
const paymentInfo = await mwcPay.getPaymentInfo(payment["payment_id"]);

// Get price
const price = await mwcPay.getPrice();

// Get public server info
const publicServerInfo = await mwcPay.getPublicServerInfo();

Functions

1. MWC Pay constructor: constructor(privateServer: string = "http://localhost:9010"): MwcPay

   This constructor is used to create an MwcPay object and it accepts the following parameter:

   • privateServer: string (optional): The URL for your MWC Pay's private server. If not provided then the default value http://localhost:9010 will be used.

   This method returns the following value:

   • MwcPay: An MwcPay object.

2. MWC Pay create payment method: async createPayment(price: string | null, requiredConfirmations: number | null, timeout: number | null, completedCallback: string, receivedCallback: string | null = null, confirmedCallback: string | null = null, expiredCallback: string | null = null): {payment_id: string; url: string; recipient_payment_proof_address: string;} | false | null

   This method is used to create a payment and it accepts the following parameters:

   • price: string | null: The expected amount for the payment. If null then any amount will fulfill the payment.
   • requiredConfirmations: number | null: The required number of on-chain confirmations that the payment must have before it's considered complete. If null then one required confirmation will be used.
   • timeout: number | null: The duration in seconds that the payment can be received. If null then the payment will never expire.
   • completedCallback: string: The HTTP GET request that will be performed when the payment is complete. If the response status code to this request isn't HTTP 200 OK, then the same request will be made at a later time. This request can't follow redirects. This request may happen multiple times despite a previous attempt receiving an HTTP 200 OK response status code, so make sure to prepare for this and to respond to all requests with an HTTP 200 OK response status code if the request has already happened. All instances of __id__, __completed__, and __received__ are replaced with the payment's ID, completed timestamp, and received timestamp respectively.
   • receivedCallback: string | null (optional): The HTTP GET request that will be performed when the payment is received. If the response status code to this request isn't HTTP 200 OK, then an HTTP 500 Internal Error response will be sent to the payment's sender when they are sending the payment. This request can't follow redirects. This request may happen multiple times despite a previous attempt receiving an HTTP 200 OK response status code, so make sure to prepare for this and to respond to all requests with an HTTP 200 OK response status code if the request has already happened. All instances of __id__, __price__, __sender_payment_proof_address__, __kernel_commitment__, and __recipient_payment_proof_signature__ are replaced with the payment's ID, price, sender payment proof address, kernel commitment, and recipient payment proof signature respectively. If not provided or null then no request will be performed when the payment is received.
   • confirmedCallback: string | null (optional): The HTTP GET request that will be performed when the payment's number of on-chain confirmations changes and the payment isn't completed. The response status code to this request doesn't matter. This request can't follow redirects. All instances of __id__, and __confirmations__ are replaced with the payment's ID and number of on-chain confirmations respectively. If not provided or null then no request will be performed when the payment's number of on-chain confirmations changes.
   • expiredCallback: string | null (optional): The HTTP GET request that will be performed when the payment is expired. If the response status code to this request isn't HTTP 200 OK, then the same request will be made at a later time. This request can't follow redirects. This request may happen multiple times despite a previous attempt receiving an HTTP 200 OK response status code, so make sure to prepare for this and to respond to all requests with an HTTP 200 OK response status code if the request has already happened. All instances of __id__ are replaced with the payment's ID. If not provided or null then no request will be performed when the payment is expired.

   This method returns the following values:

   • {payment_id: string; url: string; recipient_payment_proof_address: string;}: The payment was created successfully. This object contains the payment_id: string, url: string, and recipient_payment_proof_address: string of the created payment.
   • false: An error occurred on the private server and/or communicating with the private server failed.
   • null: Parameters are invalid.

3. MWC Pay get payment info method: async getPaymentInfo(paymentId: string): {url: string; price: string | null; required_confirmations: number; received: boolean; confirmations: number; time_remaining: number | null; status: string; recipient_payment_proof_address: string;} | false | null

   This method is used to get the status of a payment and it accepts the following parameter:

   • paymentId: string: The payment's ID.

   This method returns the following values:

   • {url: string; price: string | null; required_confirmations: number; received: boolean; confirmations: number; time_remaining: number | null; status: string; recipient_payment_proof_address: string;}: This object contains the payment's url: string, price: string | null, required_confirmations: number, received: boolean, confirmations: number, time_remaining: number | null, status: string, and recipient_payment_proof_address: string. The status: string can be one of the following values: Expired, Not received, Received, Confirmed, or Completed.
   • false: An error occurred on the private server and/or communicating with the private server failed.
   • null: Parameters are invalid and/or the payment doesn't exist.

4. MWC Pay get price method: async getPrice(): string | false | null

   This method is used to get the price of MimbleWimble coin and it returns the following values:

   • string: The price of MimbleWimble Coin in USDT.
   • false: An error occurred on the private server and/or communicating with the private server failed.
   • null: Parameters are invalid and/or the price API is disabled on the private server.

5. MWC Pay get public server info method: async getPublicServerInfo(): {url: string; onion_service_address: string | null;} | false | null

   This method is used to get info about MWC Pay's public server and it returns the following values:

   • {url: string; onion_service_address: string | null;}: This object contains the public server's url: string and onion_service_address: string | null.
   • false: An error occurred on the private server and/or communicating with the private server failed.
   • null: Parameters are invalid.