Question
Is the opening supplication and the intention to start the prayer in the obligatory (prayer) or in the Sunnah? And should the intention be made secretly or aloud?
Answer
I say, and with God's help: The intention for prayer precedes it, and it is a condition in both obligatory and voluntary prayers. It is recommended to be made aloud, and the opening supplication is a Sunnah in both obligatory and voluntary prayers. And God knows best.