= $this->get_meta_date( $id, 'start_date' );

		if ( empty( $start_date ) ) {
			// If no meta start date is set, use subscription date.
			$start_date = clone $subscription->date;
		}

		$subscription->start_date = $start_date;

		// End Date.
		$end_date = $this->get_meta_date( $id, 'end_date' );

		if ( empty( $end_date ) && null !== $subscription->frequency && null !== $date_interval ) {
			// @link https://stackoverflow.com/a/10818981/6411283
			$period = new DatePeriod( $start_date, $date_interval, $subscription->frequency );

			$dates = iterator_to_array( $period );

			$end_date = end( $dates );
		}

		$subscription->end_date = $end_date;

		// Expiry Date.
		$expiry_date = $this->get_meta_date( $id, 'expiry_date' );

		if ( empty( $expiry_date ) && null !== $date_interval ) {
			// If no meta expiry date is set, use start date + 1 interval period.
			$expiry_date = clone $start_date;

			$expiry_date->add( $date_interval );
		}

		$subscription->expiry_date = $expiry_date;

		// Next Payment Date.
		$subscription->next_payment_date = $this->get_meta_date( $id, 'next_payment' );

		// Next Payment Delivery Date.
		$subscription->next_payment_delivery_date = $this->get_meta_date( $id, 'next_payment_delivery_date' );

		if ( empty( $subscription->next_payment_delivery_date ) && null !== $subscription->next_payment_date ) {
			$subscription->next_payment_delivery_date = clone $subscription->next_payment_date;
		}

		// Legacy.
		parent::read_post_meta( $subscription );
	}

	/**
	 * Update payment post meta.
	 *
	 * @link https://github.com/woocommerce/woocommerce/blob/3.2.6/includes/data-stores/class-wc-order-data-store-cpt.php#L154-L257
	 * @param Subscription $subscription The subscription to update the post meta for.
	 * @return void
	 */
	private function update_post_meta( $subscription ) {
		$id = $subscription->get_id();

		if ( empty( $id ) ) {
			return;
		}

		$customer = $subscription->get_customer();

		$this->update_meta( $id, 'config_id', $subscription->config_id );
		$this->update_meta( $id, 'key', $subscription->key );
		$this->update_meta( $id, 'source', $subscription->source );
		$this->update_meta( $id, 'source_id', $subscription->source_id );
		$this->update_meta( $id, 'frequency', $subscription->frequency );
		$this->update_meta( $id, 'interval', $subscription->interval );
		$this->update_meta( $id, 'interval_period', $subscription->interval_period );
		$this->update_meta( $id, 'description', $subscription->description );
		$this->update_meta( $id, 'email', ( null === $customer ? null : $customer->get_email() ) );
		$this->update_meta( $id, 'customer_name', ( null === $customer ? null : strval( $customer->get_name() ) ) );
		$this->update_meta( $id, 'payment_method', $subscription->payment_method );
		$this->update_meta( $id, 'start_date', $subscription->start_date );
		$this->update_meta( $id, 'end_date', $subscription->end_date );
		$this->update_meta( $id, 'expiry_date', $subscription->expiry_date );
		$this->update_meta( $id, 'next_payment', $subscription->next_payment_date );
		$this->update_meta( $id, 'next_payment_delivery_date', $subscription->next_payment_delivery_date );

		$display_phase = $subscription->get_display_phase();

		if ( null !== $display_phase ) {
			$this->update_meta( $id, 'currency', $display_phase->get_amount()->get_currency()->get_alphabetic_code() );
			$this->update_meta( $id, 'amount', $display_phase->get_amount()->format() );
		}

		$this->update_meta_status( $subscription );
	}

	/**
	 * Update meta status.
	 *
	 * @param Subscription $subscription The subscription to update the status for.
	 * @return void
	 */
	public function update_meta_status( $subscription ) {
		$id = $subscription->get_id();

		if ( empty( $id ) ) {
			return;
		}

		$previous_status = $this->get_meta( $id, 'status' );

		$this->update_meta( $id, 'status', $subscription->status );

		if ( $previous_status !== $subscription->status ) {
			$old = $previous_status;
			$old = empty( $old ) ? 'unknown' : $old;
			$old = strtolower( $old );

			$new = $subscription->status;
			$new = empty( $new ) ? 'unknown' : $new;
			$new = strtolower( $new );

			$can_redirect = false;

			do_action( 'pronamic_subscription_status_update_' . $subscription->source . '_' . $old . '_to_' . $new, $subscription, $can_redirect, $previous_status, $subscription->status );
			do_action( 'pronamic_subscription_status_update_' . $subscription->source, $subscription, $can_redirect, $previous_status, $subscription->status );
			do_action( 'pronamic_subscription_status_update', $subscription, $can_redirect, $previous_status, $subscription->status );
		}
	}
}