public function __construct() {

		add_filter( 'lifterlms_payment_gateways', array( $this, 'add_core_gateways' ) );

		/**
		 * Filters the list of registered LifterLMS Payment Gateway classes.
		 *
		 * @since 3.0.0
		 *
		 * @param string[] $gateways Array of payment gateway class names.
		 */
		$gateways = apply_filters( 'lifterlms_payment_gateways', $this->payment_gateways );

		foreach ( $gateways as $gateway ) {

			$load_gateway = new $gateway();

			$order = absint( $load_gateway->get_display_order() );

			// If the order already exists create a new order for it.
			if ( isset( $this->payment_gateways[ $order ] ) ) {
				$order = max( array_keys( $this->payment_gateways ) ) + 1;
			}

			$this->payment_gateways[ $order ] = $load_gateway;
		}

		ksort( $this->payment_gateways );

	}