Follow the below steps to send SMS seamlessly-
i) Sender ID Approval (Some countries have specific rules and regulations for Sender ID) -
To send SMS globally - Follow sender ID rules for different countries
#Note - For Indian companies to send SMS in India - Follow DLT guide
ii) Template (To keep your communication secure, spam free, and easy to edit anytime)
Add a Template for transactional SMS in MSG91 - Follow its quick process
iii) Automate this SMS via RESTful APIs
Integrate a single Campaign API for all channels - HelpDoc [Recommended]
OR
Integrate APIs separately for every channel -
For very specific use case which is not being solved by Campaign APIs - Use dedicated SMS API
#Note - If you are implementing OTP/Phone verification then use its dedicated service i.e. SendOTP - Follow its doc here