Do I understand correctly the algorithm of the bot that will create tasks through the api todoist?

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The text of my previous question is here as a preface to this new question:

I want the simplest and fastest creation of a task from a message in a cart. And then there is not enough time to parse the cart for tasks. Switching after each message to a task manager and creating a task there is also an unnecessary distraction from the main workflow.
That is, the scenario is approximately like this: Someone wrote me a request/question/task in the cart, I redirect this message to the bot/task service integration for further distributing them there (no whims, except for the text of the task itself and identifying the contact who sent the message to the cart (Ideally, the name of the contact from the address book of the cart.)
I like it in terms of speed and platform (google tasks, trello, todoist).

Since Google did not give anything good, I decided for myself to build such a bot on my knee. But since, apart from notifications on bash, I did nothing more seriously. Need expert advice.

End goal: Have a channel (or group, whatever) that you can forward messages to or just send text that will be created as a task in todoist (or trello) via their api.

The question is, how exactly should it look?
1. Create a channel (or group), add your bot there.
2. We create an application on our server (node.js , python, or even bash, whichever is easier for such a task).
3. When sending any message to this channel/group, the bot redirects it (how does it redirect, by the way?) to the server from point 2.
4. The server from point 2 processes the message that came from the bot and fires through api to todoist.

Am I understanding this correctly? If not, please tell me how to achieve the goal more correctly?
PS I'm not a developer, but I'll try to master such a simple one.
Thank you.