Learn Farsi: آیا شما مجبور هستید که برای این جراحی پول آمبولانس را پرداخت کنید؟ - Are you obliged to pay the ambulance fee for this surgery?

It uses the phrase مجبور بودن (to be obliged) combined with the connector که (that) and a present subjunctive verb. Here, مجبور هستید (you are obliged) triggers the subjunctive form of the second verb, پرداخت کنید (you pay), because the payment is an expected action rather than a stated fact.

Why doesn't the subjunctive verb پرداخت کنید have the usual بـ prefix?

پرداخت کردن (to pay) is a compound verb. When making the present subjunctive for compound verbs formed with کردن, you only conjugate the کردن part. The subjunctive form is کنید, which stands on its own without needing an extra بـ prefix attached to the non-verbal part (پرداخت).

Why does the specific object marker را come after آمبولانس instead of پول?

The direct object of the verb is the entire noun phrase پول آمبولانس (the ambulance fee). In Farsi, the specific object marker را always comes at the very end of the entire noun phrase it modifies, not immediately after the head noun.

In everyday speech, is the connector که strictly required here?

No, it is very common to drop که in spoken Farsi. You can absolutely say مجبور هستید برای این جراحی پول آمبولانس را پرداخت کنید and the sentence remains perfectly understood because the subjunctive verb already signals the dependent clause.