Feature request

• Extension name: firestore-stripe-payments

Is your feature request related to a problem? Please describe.

I want to offer users the option to go through checkout without a payment option, which is already supported with payment_method_collection: "if_required". However, if their trial ends and they haven't provided a payment method, I'd like the subscription to be paused instead of cancelled.

Describe the solution you'd like

I believe the solution is to include the below map into subscription_data, similar to what's being done for trial_period_days. Could be as simple as exposing a field called trial_end_behavior that takes a string and defaults to "cancel".

trial_settings: {
  end_behavior: {
    missing_payment_method: "paused",
  },
}

Describe alternatives you've considered

I suppose I could wait for the subscription object to get created and then modify it after checkout. Not ideal though.

Additional context

n/a