Is it possible to transfer to messenger Facebook, any identifier by which it will be possible to change the first step?

Question

PHP

There is a task
Depending on the advertising campaign, change the response text and user steps in the chat bot.
The user will get to the bot from the site.
There are 11 advertising campaigns in total, but if in telegrams, for example, I can just create 11 bots. Then I can’t create several bots in messenger because there is only one page on Facebook (
Maybe someone has an idea or he has implemented a similar task, I will be grateful for any information)