Get402 Client Node.js

Build Paid APIs with Ease. This library simplifies offering of APIs that can be accessed only via micropayments

Installation

npm install --save get402

Usage

See https://get402.com/docs for complete documentation.

You may import the entire library or load only specific objects as needed.

import * as get402 from 'get402'

Authentication

Your Get402 API is identified by a public/private key pair where the public address is used to identify your API and the private key is used to sign requests to get402.com.

Using Existing API Private Key

import { App } from 'get402'

const privatekey = process.env.GET402_API_PRIVATE_KEY

const app = App.load(privatekey)

console.app('identifier', app.identifier)

Generating A New API PrivateKey

import { App } from 'get402'

const app = App.createNew();

console.log('privatekey', app.privatekey)

console.log('identifier', app.identifier)

One you load your app using its private key there is no more work to do, all signing of requests is handled automatically by the library.

Get Client API Key Balance

All clients start with a balance of zero credits available, which can be queried any time

Creating a New Client

const client = app.createClient()

console.log('client id', client.identifier)

Getting Balance For An Existing Client

const clientId = process.env.GET402_CLIENT_ID

const client = app.createClient(clientId)

console.log('client id', client.identifier)

Charge Client API Key

When a client uses your API you should charge their API key which reduces their available balance of credits.

const clientId = process.env.GET402_CLIENT_ID

const client = app.createClient(clientId)

const result = await client.chargeCredit({ credits: 1 })

console.log(result)

If their balance of credits goes to zero you will receive an error including a PaymentRequired request with details on purchasing additional credits. If you do not want to receive an error here always check the balance first.

import { PaymentRequired } from 'get402'

try {

  const client = app.createClient()

  await client.chargeCredit({ credits: 1 })

} catch(result) {
  
  if (result instanceof PaymentRequired) {

    console.log('payment request', result)

  }

}

Add Funds To Client API Key

Getting a Payment Request To Buy More Credits

To purchase additional credits simply request a new payment template for any number of credits. You will receive a standard payment request which wallets know how to fulfill.

const client = app.createClient(process.env.GET402_CLIENT_ID, process.env.GET402_CLIENT_PRIVATEKEY)

let paymentRequest = await client.requestBuyCredits(10)

console.log(paymentRequest)

Using Client Key To Purchase More Credits Directly

Since client API keys are actually public/private key pairs capable of holding funds directly, this library provides a utility for purchasing new credits using the client private key directly. First you must load your client funds by sending satoshis to the client identifier address. Once funds arrive they will be available for purchasing credits.

const client = app.createClient(process.env.GET402_CLIENT_ID, process.env.GET402_CLIENT_PRIVATEKEY)

let result = await client.buyCredits(10)

console.log(result)

Once payment is sent your client API key will immediately be credited with additional credits

Development & Testing

Development requires the use of typescript.

npm install

To run the tests you must set GET402_PRIVATE_KEY environment variable either in the shell or a .env file

npm test

Command Line Usage

You may use the command line package provided to fund keys and interact with the get402.com API

Installation

npm install -g get402

Usage

Usage: get402 [options] [command]

Options:
  -h, --help                     display help for command

Commands:
  buycredits <app_id> <credits>
  balance <app_id> <client_id>
  help [command]                 display help for command

The buycredits command will prompt you to enter the client private key in a hidden field.