*/
function llms_can_gateway_be_used_for_plan_or_order( $gateway_id, $plan_or_order, $wp_err = false, $enabled_only = true ) {

	$can_use = true;

	$plan_or_order = is_numeric( $plan_or_order ) ? llms_get_post( $plan_or_order ) : $plan_or_order;
	$err_data      = compact( 'gateway_id', 'plan_or_order' );
	$order         = is_a( $plan_or_order, 'LLMS_Order' ) ? $plan_or_order : null;
	$plan          = ! $order && is_a( $plan_or_order, 'LLMS_Access_Plan' ) ? $plan_or_order : null;

	if ( is_null( $order ) && is_null( $plan ) ) {
		$can_use = new WP_Error( 'post-invalid', __( 'A valid order or access plan must be supplied.', 'lifterlms' ), $err_data );
	} else {

		$gateway = llms()->payment_gateways()->get_gateway_by_id( $gateway_id );
		if ( ! $gateway ) {
			$can_use = new WP_Error( 'gateway-invalid', __( 'The selected payment gateway is not valid.', 'lifterlms' ), $err_data );
		} elseif ( $enabled_only && ! $gateway->is_enabled() ) {
			$can_use = new WP_Error( 'gateway-disabled', __( 'The selected payment gateway is not available.', 'lifterlms' ), $err_data );
		} elseif ( ! $gateway->can_process_access_plan( $plan, $order ) ) {
			// Check whether the gateway can process the plan or the order's plan (which is the plan at the moment of the order's creation).
			$can_use = new WP_Error( 'gateway-support-plan', __( 'The selected payment gateway is not available for the given plan.', 'lifterlms' ), $err_data );
		} elseif ( $plan_or_order->is_recurring() && ! $gateway->supports( 'recurring_payments' ) ) {
			$can_use = new WP_Error( 'gateway-support-recurring', __( 'The selected payment gateway does not support recurring payments.', 'lifterlms' ), $err_data );
		} elseif ( ! $plan_or_order->is_recurring() && ! $gateway->supports( 'single_payments' ) ) {
			$can_use = new WP_Error( 'gateway-support-single', __( 'The selected payment gateway does not support one-time payments.', 'lifterlms' ), $err_data );
		}
	}

	/**
	 * Filters whether or not a gateway can be used for a given plan or order.
	 *
	 * @since 7.0.0
	 *
	 * @param boolean|WP_Error $can_be_used Whether or not the gateway can be used for the plan. This value will be `true`
	 *                                      when the gateway can be used an an error object when it cannot.
	 * @param string           $gateway_id  The LLMS_Payment_Gateway ID.
	 * @param LLMS_Access_plan $plan        The access plan object.