How must the serve be executed in padel?

The server must bounce the ball once on the ground behind the service line and strike it underhand at or below waist height (1.06 m). At least one foot must remain on the ground behind the line — no walking, running, or jumping is permitted. The ball must travel diagonally into the receiver's opposite service box. The server gets two attempts, and a serve that clips the net but lands correctly is a let and is replayed.