astrapay/lib/mpesa.js

AstraPay SDK for integrating M-Pesa STK Push in Node.js applications.

const axios = require("axios");
const base64 = require("base-64");

class AstraPay {
  constructor({ consumerKey, consumerSecret, shortcode, passkey, callbackUrl }) {
    this.consumerKey = consumerKey;
    this.consumerSecret = consumerSecret;
    this.shortcode = shortcode;
    this.passkey = passkey;
    this.callbackUrl = callbackUrl;
  }

  async getAccessToken() {
    const auth = Buffer.from(`${this.consumerKey}:${this.consumerSecret}`).toString("base64");
    const res = await axios.get("https://sandbox.safaricom.co.ke/oauth/v1/generate?grant_type=client_credentials", {
      headers: {
        Authorization: `Basic ${auth}`
      }
    });
    return res.data.access_token;
  }

  async pay({ phone, amount }) {
    const token = await this.getAccessToken();
    const timestamp = new Date().toISOString().replace(/[-T:.Z]/g, "").slice(0, 14);
    const password = base64.encode(`${this.shortcode}${this.passkey}${timestamp}`);

    const payload = {
      BusinessShortCode: this.shortcode,
      Password: password,
      Timestamp: timestamp,
      TransactionType: "CustomerPayBillOnline",
      Amount: amount,
      PartyA: phone,
      PartyB: this.shortcode,
      PhoneNumber: phone,
      CallBackURL: this.callbackUrl,
      AccountReference: "AstraPay",
      TransactionDesc: "Payment"
    };

    const res = await axios.post(
      "https://sandbox.safaricom.co.ke/mpesa/stkpush/v1/processrequest",
      payload,
      {
        headers: {
          Authorization: `Bearer ${token}`
        }
      }
    );

    return res.data;
  }
}

module.exports = AstraPay;