Messenger: Structured Message
You can call chatbot blocks from your Facebook ads. To do that, you have to create a structured message for your ad.
Follow the instructions at facebook.com/business. After that, you should have a JSON-file structured like this:
The red marked lines are relevant for the inclusion of your chatbot messages in the last step.
Choose the block you want to link with the ad in your chatbot now, to open its property dialog window.
At the bottom of the window you can find the section Facebook Link. Click Connect Facebook Ad.
The new dialog window shows a line beginning with "payload":
Copy this line and overwrite one of the red marked lines in your JSON-file from step 1. It should then look like this: