Twilio 외국 사이트 $0.0494 -> 65원

https://www.twilio.com/en-us/sms/pricing/kr

coolsms 건당 20원

https://coolsms.co.kr/

https://shxrecord.tistory.com/326

https://blog.naver.com/funsms/223476801690

https://mingeesuh.tistory.com/entry/카카오-알림톡-api-완벽정복