The API allows you to send messages through your projects and services over the HTTP/HTTPS, SMTP, and SMPP protocols. Ready-made libraries in different programming languages connect to your project and help you send messages from anywhere with a single command.
Sending a telegram message "Hello" to the number "79999999999" in the telegram bot "@mybot_bot":
https://smscentre.com/sys/send.php?login=alex&psw=123&phones=79999999999&mes=Hello&bot=@mybot_bot
Sending a telegram message "Hello" to the number "79999999999" in the telegram bot "@mybot_bot" with the smsreq parameter of the number of days after which it will be necessary to confirm the phone number with an SMS code: