https://developers.google.com/gmail/api/v1/reference/ 결론은 요놈들을 본받자. https://developers.google.com/gmail/api/v1/reference/ https://developers.google.com/ad-exchange/buyer-rest/v1.3/ https://developers.google.com/ad-exchange/seller-rest/reference/v2.0/?hl=ko 페이팔 https://developer.paypal.com/docs/api/ 페이스북 https://developers.facebook.com/docs/graph-api/common-scenarios 드롭박스 https://www.dropbox.com/..