Handwrytten plugin

Use Handwrytten through Corsair: one client, typed API calls. Authenticate with your Handwrytten API key generated on the Integrations page. Requests pass the key directly in the Authorization header without a Bearer prefix. You can toggle Test Mode in your Handwrytten dashboard during development to simulate orders without fulfillment charges. What you get:

55 typed API operations

Setup

Install

npm install corsair @corsair-dev/handwrytten better-sqlite3
npm install --save-dev @types/better-sqlite3

yarn add corsair @corsair-dev/handwrytten better-sqlite3
yarn add --dev @types/better-sqlite3

pnpm install corsair @corsair-dev/handwrytten better-sqlite3
pnpm install --save-dev @types/better-sqlite3

bun add corsair @corsair-dev/handwrytten better-sqlite3
bun add --dev @types/better-sqlite3

Add the plugin

corsair.ts

import Database from 'better-sqlite3';
import { createCorsair } from 'corsair';
import { handwrytten } from '@corsair-dev/handwrytten';

export const corsair = createCorsair({
	plugins: [
		handwrytten(),
	],
	database: new Database('corsair.db'),
	kek: process.env.CORSAIR_KEK!,
	multiTenancy: true,
	hub: {
		projectApiKey: process.env.CORSAIR_API_KEY!,
		signingSecret: process.env.CORSAIR_SIGNING_SECRET!,
	},
});

With multiTenancy: true, scope calls with corsair.withTenant(id). See Quick start for KEK + Hub keys, and Multi-tenancy for account isolation.

Choose authentication

API Key (Recommended)

Store the Handwrytten API key before the first call: pnpm corsair setup --plugin=handwrytten --tenant=acme api_key=<your-key> (leave out --tenant without multiTenancy), or pass it as key in the plugin options. With Hub, each tenant enters their own key on the connect page. See API key auth.

handwrytten()

More: API Key

Connect a tenant

Mint a connect link and send the tenant to it. Hub hosts the page and delivers the result to your app — see Connect / OAuth.

const { connectUrl } = await corsair.manage.connect.createLink({
	plugin: 'handwrytten',
	tenantId: 'acme',
});
// redirect the user's browser to connectUrl

Example API calls

List available greeting cards

const tenant = corsair.withTenant('acme');
await tenant.handwrytten.api.cards.list({});

Send a personalized handwritten note

const tenant = corsair.withTenant('acme');
await tenant.handwrytten.api.orders.sendSingle({
	card_id: 101,
	message: 'Thank you for your partnership and support!',
	font_label: 'Chill Charity',
	sender_address1: '1 Market St',
	sender_city: 'Austin',
	sender_zip: '78701',
	recipient_first_name: 'Jane',
	recipient_last_name: 'Doe',
	recipient_address1: '123 Main St',
	recipient_city: 'Austin',
	recipient_state: 'TX',
	recipient_zip: '78701',
});

See the full list on the API page.

What’s next

API reference

Every handwrytten.api.* operation with input and output types.

Connect / OAuth

createLink, Hub delivery, and tenant connect flows.

Use with agents

Expose this plugin’s operations as MCP tools.

Overview

Plugins