You can use the DLT SMS API to send DLT-approved messages via Fast2SMS. This is a simple API in which you just need to pass variable_values & all other details will be managed by Fast2SMS.
Service Implicit/Inferred: All Transactional & Service SMS will come under this category, like OTP, Alerts, and Informative SMS. This route is for all numbers (DND+NonDND) & will work 24×7.
Service Explicit/Promotional: All types of promotional or marketing SMS will come under this category. This route can only deliver SMS on NonDND numbers from 10 AM to 9 PM.
Header & Template Submission in DLT Manager:
Before sending messages through DLT SMS API, you must first submit your DLT-approved header and templates details in Fast2SMS. After submission, you will receive message id for each approved template, which can be passed in message= parameter of the API request.
NOTE: If you want to send DLT-approved messages directly without saving them in Fast2SMS, use DLT SMS (Manual) API.