Selling a SaaS plan or a digital product from a Next.js app usually means two jobs: taking the payment, and then handling VAT, sales tax and invoices for buyers in other countries. This post sets up both in two route handlers with @agentaos/nextjs . AgentaOS is a merchant of record: it sells the product in its own name, charges the buyer's VAT or sales tax, issues the invoice and pays you out.

You need:

a Next.js app with the App Router

an AgentaOS account (test mode works from the first minute)

a product created in the AgentaOS dashboard, and its link ID from the product page

1. Install and set the keys

npm install @agentaos/nextjs

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In the dashboard, create an API key under Developers → API keys ( sk_test_... in test mode). Under Settings → Developers → Webhooks , set the URL to https://your-domain.com/api/webhooks/agentaos and copy the signing secret.

# .env.local AGENTAOS_API_KEY = sk_test_...…