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In order to register the template, you will first need to have done the Entity Registration with the operators. Find out more about it - Here.
You will also need to do the SenderID registration with the operators as well. Read more about this - Here.
The Template registration process is quite simple across operators and you can find the guide for each operator below:
Once you have applied for the template, you will hear back from the operators regarding the status within 24-48 hours.