You can send a personalized SMS to all the numbers who send an SMS to your Longcode number.
1. You need to put in a callback URL in our webhook on which we will push the data of the SMS received from the client.
2. You can fetch the data and store it from that URL and integrate an API to customize your SMS according to the SMS received.
P.S. You can learn how to set a callback URL from the link mentioned below: