It is a popular bulk SMS service provider in India.
Transactional messages are sent in response to a user's interaction with your website or business or service. Examples include shipping notifications, account alerts, and identity validation.
Lets see how to send quick transactional messages using(OTP) Fast2sms.
1)Create an account in Fast2sms and recharge your wallet.
2)Find you API key in your account:
3)Generate random numbers of your choice of number of digits.
4)Call the functions int the above files (node js GET/POST, Javascript where ever necessary.
5)Success message will be received in json format(Sample in file above).
You can enable advanced security features like
whitelisting IP addresses that hit the API.So that it will respond only when request comes from your server.