public function set_amount( $amount ) {
		$amount = wc_format_decimal( $amount );

		if ( ! is_numeric( $amount ) ) {
			$amount = 0;
		}

		if ( $amount < 0 ) {
			$this->error( 'coupon_invalid_amount', __( 'Invalid discount amount', 'woocommerce' ) );
		}

		if ( 'percent' === $this->get_discount_type() && $amount > 100 ) {
			$this->error( 'coupon_invalid_amount', __( 'Invalid discount amount', 'woocommerce' ) );
		}

		$this->set_prop( 'amount', $amount );
	}