private function validate_selected_gateway( $gateway_id, $plan ) {

		$gateway = llms()->payment_gateways()->get_gateway_by_id( $gateway_id );
		$err     = new WP_Error();

		// Valid gateway.
		if ( is_subclass_of( $gateway, 'LLMS_Payment_Gateway' ) ) {

			// Gateway not enabled.
			if ( 'manual' !== $gateway->get_id() && ! $gateway->is_enabled() ) {

				return $err->add( 'gateway-error', __( 'The selected payment gateway is not currently enabled.', 'lifterlms' ) );

				// It's a recurring plan and the gateway doesn't support recurring.
			} elseif ( $plan->is_recurring() && ! $gateway->supports( 'recurring_payments' ) ) {
				// Translators: %s = The gateway display name.
				return $err->add( 'gateway-error', sprintf( __( '%s does not support recurring payments and cannot process this transaction.', 'lifterlms' ), $gateway->get_title() ) );

				// Not recurring and the gateway doesn't support single payments.
			} elseif ( ! $plan->is_recurring() && ! $gateway->supports( 'single_payments' ) ) {
				// Translators: %s = The gateway display name.
				return $err->add( 'gateway-error', sprintf( __( '%s does not support single payments and cannot process this transaction.', 'lifterlms' ), $gateway->get_title() ) );

			}
		} else {

			return $err->add( 'invalid-gateway', __( 'An invalid payment method was selected.', 'lifterlms' ) );

		}

		return $gateway;

	}