Partially Blind Unmarshaling with Golang.

RequestMade.go

package triggertypes

import "time"

// RequestMade ...
type RequestMade struct {
	Requester   int        `json:"requester"` // sapphire userID
	RequestID   int        `json:"requestID"`
	EventID     int        `json:"eventID"`
	CreatedDate *time.Time `json:"createdDate"` // Here just incase its lost or delayed.
}

const requestMadeType = "RequestMade"

// GetRequestMadeTypeString ...
func GetRequestMadeTypeString() string {
	return requestMadeType
}

// GetTypeString ...
func (trigger *RequestMade) GetTypeString() string {
	return requestMadeType
}

UnmarshalInto.go

package triggertypes

import (
	"encoding/json"
	"errors"
	"io"
)

// Unmarshal ...
func Unmarshal(triggerType string, reader io.ReadCloser) (t interface{}, err error) {
	t = nil
	decoder := json.NewDecoder(reader)

	switch triggerType {
	case requestMadeType:
		t = &RequestMade{}
		return
	}

	if t != nil {
		err = decoder.Decode(&t)
		if err != nil {
			return nil, err
		}
	}
	return nil, errors.New("Unknown type")
}