The SMS service provider “ClickSend” has a REST API https://developers.clicksend.com/docs/rest/v3/ and a HTTP API https://developers.clicksend.com/docs/http/v2/#introduction . The provider Twilio has a Node.js SDK https://www.twilio.com/docs/sms/quickstart/node .  Both have the same pricing structure. All other things being equal, which method would you recommend as easier to implement for a beginner? (REST, HTTP or Node.js) to run using Arduino IDE?  I’ve followed several of your tutorials where you use HTTP & Node.js (including the Firebase course) and it seems this is feasible? Many thanks!