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Building a Plugin

Scaffold

npx carphacom-cli create plugin --type=payment --id=my-pay
cd my-pay
npm install

Generated layout:

my-pay/
  src/
    index.ts            # entrypoint — exports register(), unregister()
    provider.ts         # for payment/fulfillment plugins
    admin/page.tsx      # for admin-extension plugins
  manifest.json
  package.json
  tsconfig.json
  README.md

Implement the entrypoint

// src/index.ts
import type { CarphaPlugin } from "@carphacom/sdk"

const plugin: CarphaPlugin = {
  async register({ medusa, config }) {
    // Wire up routes, providers, migrations
  },
  async unregister() {
    // Cleanup if needed
  },
}

export default plugin

Add a payment provider

// src/provider.ts
import { AbstractPaymentProvider } from "@medusajs/framework"

export class StripeLikeProvider extends AbstractPaymentProvider {
  static identifier = "my-pay"

  async initiatePayment(input) { /* ... */ }
  async authorizePayment(input) { /* ... */ }
  async capturePayment(input) { /* ... */ }
  async refundPayment(input) { /* ... */ }
  async cancelPayment(input) { /* ... */ }
  async retrievePayment(input) { /* ... */ }
}

Reference it from manifest.json:

"medusa_provider": {
  "module": "payment",
  "resolve": "./dist/provider.js",
  "id": "my-pay"
}

Local development against a real instance

Symlink: cd /opt/carphacom/installed && ln -s ~/dev/my-pay my-pay
Insert a row directly in carphacom_plugin (status installed, manifest copied from your manifest.json).
pm2 restart carphacom-backend.
Edit code, rebuild (npm run build), pm2 restart carphacom-backend again.

Build for distribution

npm run build         # tsc / rollup → dist/
npm pack              # produces my-pay-1.0.0.tgz
zip -r my-pay-1.0.0.zip dist/ manifest.json package.json README.md

Sign the package

npx carphacom-cli sign my-pay-1.0.0.zip --key ~/.carphacom/dev-key.ed25519

This emits my-pay-1.0.0.zip.sig. Both files go to the marketplace. Tenant installers verify the signature against carphacom.com's published vendor public keys before installing.