How can i add multiple plan in shopify billing api?

Retired Boards Appdev Graphql Basics And Troubleshooting
2

Following this documentation page Javascript shopify.billing.request → Multi-plan setup - charge based on user selection you have to let the user select the plan he wants before calling shopify.api.billing.request

app.get('/auth/callback', async () => {
  const callback = await shopify.auth.callback({
    rawRequest: req,
    rawResponse: res,
  });

  // Check if we require payment, using shopify.billing.check()

  const confirmationUrl = await shopify.billing.request({
    session: callback.session,
    plan: 'My billing plan',
    isTest: true,
  });

  res.redirect(confirmationUrl);
});

Does it help?