You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: available_channels.go
    path of file: ./repos/grafana/pkg/services/ngalert/notifier/channels_config
    
    the code of the file until where you have to start completion: package channels_config

import (
	"fmt"
	"os"
	"strings"

	alertingOpsgenie "github.com/grafana/alerting/receivers/opsgenie"
	alertingTemplates "github.com/grafana/alerting/templates"
)
    
func GetSecretKeysForContactPointType(contactPointType string) ([]string, error) {
	notifiers := GetAvailableNotifiers()
	for _, n := range notifiers {
		if n.Type == contactPointType {
			var secureFields []string
			for _, field := range n.Options {
				if field.Secure {
					secureFields = append(secureFields, field.PropertyName)
				}
			}
			return secureFields, nil
		}
	}
	return nil, fmt.Errorf("no secrets configured for type '%s'", contactPointType)
}