Hey @user2541 thanks for reaching out! I'm one of the Support Engineers here @ Intercom! 👍
There are 3 ways to accomplish this.
First you could use a custom bot from a button. This will trigger a custom bot to send a specific message whenever a user clicks the set button on your site. Your end user would be able to reply to this chat from the custom bot & follow a flow you set. You can find more about that in this article here.
If you don't wish to have the custom bot send you can build what’s called a “custom launcher”. This guide will show you how to create a custom launcher. However no custom reply/header will be present. It will just open the messenger homepage.
Lastly, you can use our Javascript API Intercom('showNewMessage') method, you can set a button on your site to call this method which will open the messenger on a new message, you can also choose to include a pre-populated message which could fit your use case for a custom reply/header.
Thanks for reaching out! 👍
Thank you so much for responding; we might implement the third option. Thanks much! 😊 👌