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: push.go
    path of file: ./repos/chat/server/push
    
    the code of the file until where you have to start completion: // Package push contains interfaces to be implemented by push notification plugins.
package push

import (
	"encoding/json"
	"errors"
	"time"

	t "github.com/tinode/chat/server/store/types"
)

// Push actions
con
    
func Init(jsconfig json.RawMessage) ([]string, error) {
	var config []configType

	if err := json.Unmarshal(jsconfig, &config); err != nil {
		return nil, errors.New("failed to parse config: " + err.Error())
	}

	var enabled []string
	for _, cc := range config {
		if hnd := handlers[cc.Name]; hnd != nil {
			if ok, err := hnd.Init(cc.Config); err != nil {
				return nil, err
			} else if ok {
				enabled = append(enabled, cc.Name)
			}
		}
	}

	return enabled, nil
}