Api creation to answer my LI messages

I need a small application that will have the ability to semi-automatically answer my LI messages with 2-3 possible options
I mean to have the option when I open a LI message or invite, to reply in the sender's name certain answers by pushing a button or giving me the chance to write a non-standardised message
The api sends the message and then opens the next message and so on
If this action can be stored in database will be an extra asset
Thanks