Merchant demo

Creates a checkout session on the backend, then uses the <stable-checkout> web component for the x402 + EIP-3009 flow.

Amount (USDC atomic units, 6 decimals — e.g. 1000000 = 1 USDC) Invoice reference

Checkout (web component)

After you create a session, use <stable-checkout>: click Connect & Pay and pick a wallet in Reown AppKit (mobile or desktop).