Cannot read properties of null (reading 'client_secret')

[SohelIslamImran]

Bug report

• Extension name: firestore-stripe-payments

Describe the bug

When I'm adding checkout_sessions, it is threwing this error in the createCheckoutSession functions:

❗️[Error]: Checkout session creation failed for doc [id]: Cannot read properties of null (reading 'client_secret')

To Reproduce

Steps to reproduce the behavior, please provide code snippets or a repository:

1. Create a Checkout Session :

const docRef = await db
  .collection("users")
  .doc(currentUser.uid)
  .collection("checkout_sessions")
  .add({
    client: "mobile",
    price: priceId,
    trial_period_days: STRIPE_TRIAL_PERIOD_DAYS,
  });

Expected behavior

It should create the Checkout Session and add ephemeralKeySecret & paymentIntentClientSecret in the checkout_sessions doc

Screenshots

If applicable, add screenshots to help explain your problem.

System information

• OS: Firebase Cloud Server
• Browser (if applies) [e.g. Chrome, Safari]

Additional context

The error is throwing from here I believe :

stripe-firebase-extensions/firestore-stripe-payments/functions/src/index.ts

Line 318 in 6c5966d

subscription.latest_invoice.payment_intent.client_secret;

Maybe client_secret is null here somehow..

[pr02nl]

This bug occurs when using the trial_period_days parameter, I did several tests with this parameter null or 0 and everything works as expected, however my application needs a testing period.