Sending each link: approval, Vault and store sign-in

const turn = buyFor(shopper.id).turn(message, {
  sendLink: async (link) => {
    switch (link.kind) {
      case 'vault':
        return sendStep(shopper.id, 'Add a card', link); // your code
      case 'approval':
        return sendStep(shopper.id, 'Approve the payment', link);
      case 'store_login':
        return sendStep(shopper.id, `Sign in to ${link.store ?? 'the store'}`, link);
      default:
        return sendCard(shopper.id, link); // product and store cards
    }
  },
});

import { actionWindows } from '@agent-cards/commerce-sdk/browser';

const windows = actionWindows({
  onEnded: (step, outcome) => markStepDone(step.id, outcome), // your code
  onClosed: (step) => keepOfferingStep(step.id), // your code
});

// The link's own click handler, so the browser counts the tap as the reason for the pop-up.
// When the browser blocks it, `open` returns null and the link opens as a new tab.
stepLink.addEventListener('click', (event) => {
  if (windows.open(link)) event.preventDefault();
});

// Each shopper message your server forwards from `listen` or the webhook handler.
onShopperMessage((message) => windows.settle(message)); // your code