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Prerequisites

Before installing, make sure you have the following:

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Install the Modem Pay SDK

To get started, install the SDK in your Node.js or Python project: 
npm install modem-pay

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Initialize the SDK

To authenticate requests, instantiate the SDK with your Modem Pay secret API key: 
import ModemPay from "modem-pay";

const modempay = new ModemPay("YOUR_MODEM_PAY_API_KEY");

const intent = await modempay.paymentIntents.create({ amount: 450 });

console.log(intent.data.payment_link);
🔐 Never expose your secret API key on the frontend or in public repositories.

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Get Your API Key

  1. Log in to modempay.com.
  2. Go to Developers → API Keys.
  3. Generate or copy your secret key.
  4. Use this key when initializing the SDK.

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(Optional) Install the Modem Pay CLI

For local webhook testing and simulation in a test environment, you can install the CLI globally:
bash
npm install -g modem-pay-cli
Use modempay listen to test webhooks locally and modempay trigger to simulate events.
For full CLI usage, visit the CLI docs.